Create an illustration style guide for [BRAND]. Define: illustration purpose (hero, spot, icon, decorative), style direction (flat, isometric, hand-drawn, 3D, line art), character design (if applicable — proportions, expressions, diversity), color palette for illustrations, line weight and corner style, texture and shading approach, composition rules, do/don't examples (10 each), asset library structure, brief template for commissioning illustrations, and adaptation rules for different sizes and contexts.
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