CHARACTER: Canvas 1024x1024 transparent PNG.

Style: flat vector, thick ~8px dark outlines, flat bone-ivory fills with one cel-shade tone.

Subject: front-facing human skull plus bare cervical vertebrae and clavicles/shoulder bones, symmetric about x=512.

Placement: crown y=150; domed cranium widest 520px (x=252-772) at temple level about y=330; eye sockets centred on y=420, each about 110px wide, centres x≈410 and x≈614; nasal cavity about y=500; jaw narrows to about 300px wide at the chin, y=690; mouth zone y≈590 left as a closed plain jaw line, no teeth row or open mouth drawn; vertebral neck narrowest about 150px wide at y=730; clavicles and shoulder bones run off the bottom edge at y=1024.

NO hat, eyewear, mouth, collar, scarf, shirt, coat, gears or other accessories: base only.

Output: character_base.png (1 file).

Weights file: character_weights.json with {"character_base.png":100}.

BACKGROUND: Canvas 1024x1024 opaque PNG, full bleed.

Style: flat single colour or soft two-stop vertical or radial gradient only, no scenery, objects, gears, patterns, texture or text. Single palette shared across all 12, in steampunk tones: brass, copper, rust, verdigris teal, oxblood, soot charcoal, smoky violet, parchment, deep navy, olive, amber and gunmetal. Keep the mid-tones muted so the ivory skull with dark outlines stands out.

The centre area x=252-772, y=150-1024 must stay low-contrast.

Outputs: background_01.png through background_12.png.

Weights file: background_weights.json with equal weights, 1 per file, totalling 12. Write artifacts/base.png, artifacts/background_01.png .. background_12.png, and artifacts/traits.json: {"backgrounds":[{"file","name","weight"}...]} with weights summing to 100.