Brand Illustration System

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The problem with AI illustration in a brand context is not quality. Individual images look fine. The problem is that image forty does not look like image one, and a website full of almost-consistent illustrations reads as cheaper than one with a single plain style, because inconsistency is legible to everyone even when they cannot name it.

Chasing consistency by reusing the same prompt does not work. Small wording differences produce large visual differences, and as soon as the subject changes, the style drifts with it. What you need is not a prompt but a specification - a written set of rules that any future prompt must satisfy, the same way a design system constrains components.

This prompt builds that specification. It converts a loose sense of how our illustrations should feel into explicit, checkable decisions across seven dimensions, then generates prompt templates that encode those decisions as fixed text with clearly marked variable slots.

The seven dimensions. Line treatment, covering weight, uniformity and whether outlines exist at all. Shape language, from geometric to organic, and the corner radius habit that quietly signals friendliness or precision. Colour, restricted to a named palette with defined roles rather than a mood. Depth, whether flat, layered, or shaded, since mixing these is the most visible inconsistency of all. Detail density and where detail is permitted to concentrate. Figure treatment, including the important decision about faces, which is where drift is most noticeable to viewers. Composition habits such as margin, cropping and horizon placement.

Why the fixed and variable split matters. The template makes the style portion immutable text and marks only the subject as a slot. Anyone on the team can produce a new illustration by filling the slot, without needing to understand or rewrite the style. That is what makes it a system rather than a lucky prompt.

The consistency checklist at the end is the underused part. It gives you a short list of yes-or-no questions to run against any new image before it ships. Consistency failures are hard to see in isolation and obvious in a grid, so check new work beside existing work, never alone.

One caution. Style specifications should describe visual properties, not name a living artist. Naming a contemporary illustrator to reproduce their look raises real ethical and legal questions, and it also produces a weaker specification, because you learn nothing transferable about why the look works.

You are an art director creating an illustration style specification. Produce a reusable system, not a single image prompt.

INPUTS
Brand: [what the company does]
Audience: [who sees these illustrations]
Desired feeling: [three adjectives]
Where used: [website hero, blog headers, empty states, documentation]
Existing brand colours: [hex codes if you have them]
Constraints: [anything that must be avoided]

SECTION 1 - STYLE SPECIFICATION. Make an explicit decision on every dimension. Never write it depends or leave one open.
LINE - weight, uniformity, whether outlines exist, how corners terminate.
SHAPE LANGUAGE - geometric to organic on a stated scale, corner radius habit, silhouette complexity.
COLOUR - a palette of no more than five colours with a defined role for each: background, primary subject, accent, shadow, highlight. Use the supplied brand colours where given.
DEPTH - flat, layered flat, or shaded. Pick exactly one. State how volume is implied.
DETAIL DENSITY - low, medium or high, plus where detail is permitted to concentrate and where it must not.
FIGURES - whether people appear, how they are abstracted, and the explicit decision on faces.
COMPOSITION - margin habit, cropping habit, horizon or ground treatment, typical negative space.

SECTION 2 - PROMPT TEMPLATE. Write a reusable template in which the style text is fixed and the subject is marked as [SUBJECT]. The fixed portion must encode every decision from section 1 so it cannot drift.

SECTION 3 - FIVE WORKED EXAMPLES. Fill the template for five different subjects relevant to the brand.

SECTION 4 - CONSISTENCY CHECKLIST. Eight to ten yes or no questions to run against any new illustration before it ships. Each must be objectively answerable by looking at the image.

SECTION 5 - KNOWN DRIFT RISKS. The three dimensions most likely to slip, and the correction wording for each.

RULES
Do not name any living artist or ask for their style.
Every decision must be stated as a visual property, not a feeling.
If two requested adjectives conflict visually, say so and propose which to prioritise.