Most cover mishaps are decided long before anyone opens a design app. They begin in an email that reads "something striking, maybe with a silhouette" and end with a printer rejecting the file, or a reader squinting at a grey rectangle on a phone screen. Commissioning illustration is one of the few jobs in independent publishing where a small oversight in week one can eat a fortnight of your production schedule. None of the mistakes below are dramatic. All of them are common.

The good news is that almost every one of them is preventable with an hour of preparation and a slightly colder eye. Illustration is a problem-solving job, and illustrators are very good at it. What they cannot do is guess. Every gap you leave in your brief will be filled by an assumption, and assumptions are what you pay for twice.

Write a brief that a stranger could follow

A brief is not a mood. It is a set of constraints plus one clear idea. Illustrators are good at solving problems; they cannot solve a problem you haven't described, and "something atmospheric" will produce three atmospheric options, none of them yours.

Do two hours of homework before you write it. Photograph the covers in your genre on a bookshop shelf, or open a retailer's category page, and note what readers already expect to see. You aren't copying; you're learning the visual grammar your audience reads without thinking. Thriller readers scan for darkness, tight type and a single figure. Romance readers scan for warm light, faces or the suggestion of them, and a script-adjacent font. Literary fiction is allowed to be strange, but it still has to be strange in a way that signals "literary" across a room.

Then cover the practical ground:

• Format and trim size, with bleed and safe areas marked on a template. State the final trim — 5.5 by 8.5 inches, 6 by 9, 5 by 8 — and send the actual template from your printer or print-on-demand service. Illustrators are sent the wrong template constantly, and a spine width that is out by two millimetres becomes a reprint.
• Where the artwork will live. A cover that reads well at 1,600 pixels wide on a phone is not automatically a cover that works as a 300 dpi print wrap with trim and bleed. Say which you need, ideally both, and be explicit about who is responsible for the conversion and for the final typography.
• Genre and comparison titles. Name three books your ideal reader has already bought. "Like the cover of that one, but warmer and less crowded" gives an illustrator more than two paragraphs of adjectives ever will.
• The idea, in one sentence. If you cannot say it in one sentence, you have three ideas and you need to pick one before you pay someone. "A woman walks away from a burning house, and the smoke forms a face" is a brief. "Isolation, memory, and the unreliability of the past" is a therapy session.
• Exact text. Title, subtitle, author name, series number, tagline — spelled correctly and final. A title change at the sketch stage is annoying. A title change after the final render is expensive, and usually lands on you.
• Deliverables and file names. Ask for layered source files, a print-ready PDF with bleed and crop marks, a web JPEG under 1 MB, and a square variant for audiobook and social. Name the files in the brief so nobody has to guess what "final_v3_REAL" means later.
• Deadlines and revisions. Give a date and say how many rounds of revision are included. Two is standard, three is generous, unlimited is a trap for both of you.

A brief of one page is usually enough. Two pages is fine if one of them is references. Three pages of adjectives is a warning sign that you are asking the illustrator to invent the book for you.

Treating references as instructions to copy

Sending a specific living illustrator's cover and writing "this style, please" is the most common way to start a commission badly. It puts the artist in an awkward position, it flirts with derivative work, and it rarely produces the result you actually wanted, because you were pointing at a finished piece rather than at the qualities inside it.

Describe the qualities instead. "A limited palette of bone, rust and deep green. Flat shapes rather than rendered detail. Hand-lettered type that feels slightly uneven. Lots of negative space above the figure." That is a set of instructions a professional can work with, and it will produce something original.

Mood boards are useful, but keep them honest. If eight of your ten images share a composition, say so, because that is the brief. If they contradict each other, the illustrator will pick two at random and you will be disappointed by both.

Designing for the shelf and forgetting the thumbnail

More of your sales will happen at 200 pixels tall, wedged between twenty competitors in a scrolling grid, than will ever happen in a physical shop. The thumbnail is not a compromise version of the cover; for most readers it is the cover.

Test it early. Export the sketch at thumbnail size, put it on your phone, and look at it next to the real covers in your category. Can you read the author name? Is there one focal point, or three competing ones? Does the title survive at 60 pixels? If two colours are doing the same job, remove one. If the type disappears into the background, the illustration is too busy or too light.

Tape a printout to a shelf at eye level. Step back three metres. That is the bookshop test, and it costs nothing.

The technical details nobody mentions until the printer does

These do not make the cover better, but they decide whether it prints at all.

• Colour mode. Print is CMYK. Screens are RGB. Saturated greens, bright oranges and fluorescent pinks will shift noticeably, sometimes drastically, when converted. If a specific colour matters — a brand colour, a series colour — specify it and expect a proof.
• Resolution. 300 dpi at final printed size. An image that looks sharp on your laptop may be half the resolution it needs to be.
• Spine width. Calculated from page count and paper stock, and it changes when you add a page of acknowledgements. Do the maths after typesetting is locked, not before.
• Barcode and legal space. Keep a clear white area on the lower back cover for the ISBN barcode, and check whether your printer wants it supplied or applied.
• Ebook specifics. No bleed, no crop marks, and generous margins so the retailer's overlay buttons do not sit on your title.

Contracts, rights and the awkward conversation

Nothing here is dramatic either, but it is where small publishers get stung. Put the following in writing, even if it is a two-paragraph email both parties reply to with "agreed":

1. Scope of rights. Are you licensing the image for one edition in one territory, or buying it outright? Digital, audio and foreign editions should be named if you want them.
2. Term. Perpetual, or five years with a renewal option.
3. Portfolio use. Most illustrators will want to show the work. That is usually fine; decide before it appears on their social feed the week before your launch.
4. Kill fee. If you cancel after the sketch is approved, what is paid? Thirty to fifty per cent is common and fair.
5. AI disclosure. If you are supplying generated elements, say so. If they are, ask. Ghosted lines and six-fingered hands are not the only problem; unlicensed training data is the bigger one.

A pre-flight checklist before you hit send

1. Is the title, subtitle and byline final and spelled correctly?
2. Have you attached the correct template, with trim, bleed and safe area marked?
3. Are three comparison covers named?
4. Is the core idea one sentence long?
5. Are deliverables, file formats and file names listed?
6. Is a deadline and a revision limit stated?
7. Have you agreed who owns the source files?
8. Have you tested a rough version at thumbnail size?

What to do when the first sketch is not what you pictured

Describe the problem, not the solution. "The figure feels disconnected from the type, and the palette is reading colder than I imagined" is useful. "Move his arm and make it orange" is not, because it is your attempt at a fix, and the illustrator may have a better one.

Sleep on it before replying. Sketch disappointment is normal and almost never means the commission is going wrong; it usually means the brief was thinner than you thought. Then reply in one message, with all the notes, rather than five messages over two days.

The best cover commissions are boring to manage and exciting to look at. That is the whole aim: all the drama in the artwork, none of it in the schedule.

Photo: JessBaileyDesign / Pixabay