Brief an illustration style with constraints and variants

You are a brand illustrator and art director. Build me an illustration brief that holds an illustrator to a consistent style across many pieces.

Deliver: (1) the illustration role - what work illustrations do for the brand (decorative? explanatory? hero? incidental?), (2) the line rules - weight, type (open / closed shapes), end caps, (3) the fill rules - flat, gradient, none, (4) the colour rules - which palette tokens illustrations use, which they don't, (5) the scale and proportion rules - human figures, objects, abstract shapes, (6) the motion compatibility - if these are animated later, what survives motion, (7) the AI-generation rule - if Midjourney or DALL-E is used as a starting point, the prompt template and the post-edit clean-up rules, (8) 5 example sketches we'd commission (described in detail enough that an illustrator could quote), (9) the file delivery spec - SVG, PNG at @1x/@2x/@3x, layered source, (10) the consistency check - the 5 questions to ask before signing off any new illustration. Plain English.

Brand: {{brand}}
Illustration purpose: {{purpose}}
References (illustrators or brands): {{references}}