If you generate designs with AI and sell what you make, the thing that separates a sellable set from a folder of nice images is consistency. Twelve images in twelve slightly different styles is not a product. Here is how to fix that at the prompt level.
The mistake: style as a variable
Most prompt templates you find are written like this:
A printable poster of [SUBJECT] rendered in [ART STYLE], palette [PALETTE]...
It looks flexible, and that is exactly the problem. Fill it in twelve times and you get watercolour, then line art, then something vaguely 3D. Each image might be fine. As a set they are unsellable, because the buyer wanted twelve things that match.
The fix: lock the style, vary the subject
Move the style out of the brackets and into the fixed body of the prompt, described tightly enough that the model cannot drift:
...rendered as flat cut-paper collage and never any other medium: solid shapes of matte coloured paper with clean scissor-cut edges, simple layering where shapes overlap, no drawn or inked outlines, no brush texture, no hatching, no gradients, no photorealism.
Now the only things you change are subject, layout and palette. Run it twelve times and you get twelve pieces that obviously belong together.
Negatives do most of the work
Telling a model what you want gets you halfway. Telling it what you do not want is what stops the drift. In practice the phrases that earn their place:
- no drop shadows, no gloss, no 3D depth - the difference between a print file and a mockup
- no text, letters, numbers, signature or watermark - models add fake signatures constantly
- no frame, no mount, no mockup wall - for wall art, otherwise you get a photo of a poster instead of the poster
- and never any other medium after your style description - the single most useful phrase for consistency
Fix the crop and the margin
A set that prints badly is worse than a set that looks slightly worse on screen. Two things to state explicitly:
Aspect ratio. Wall art at 2:3 fits standard frames with no cropping. Square for papers. Say it in the prompt.
Margin. Either full bleed to all four edges for tiling papers, or an even quiet margin on all sides for posters so it can be trimmed. Leave it unsaid and you get neither reliably.
Build the set before you sell it
Generate all twelve before you list anything. If piece nine drifts, your prompt is not locked and you need to tighten the negatives - not regenerate piece nine until it happens to match.
A prompt that produces a matching set on the first pass is worth keeping. One that needs cherry-picking is not finished.
Ready-made locked prompts
Every prompt pack in the PromptBase shop is built this way - one locked style per pack, subject and palette as the only variables, with 100 ready-made combinations. Commercial use is included and no artist is named in any of them.
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