Draw 12 baggy steampunk jumper variants as separate 1024x1024 RGBA PNG layers for a generative PFP collection of a FRONT-FACING skeleton bust. Match the base exactly: painterly rendering, fine dark linework, cracked ivory bone, aged brass gears/rivets, teal enamel gems, muted black/teal/brown/oxblood/mustard palette. Placement (absolute px): skull spans x=300..725, y=430..848; jaw corners at about (360,750) and (665,750); chin bottom at (512,848).

The base already wears a leather coat with lapels and a brass gorget, so each jumper must be OPAQUE and fully cover all clothing pixels from the shoulder line to the bottom edge.

Silhouette: shoulders start at y=870 at x=0 and x=1024, rise to y=760 at x=215 and x=805, and fill solidly down to y=1024 across x=0..1024. The neckline is a U-shaped opening that hugs under the jaw: from (355,760) down to (512,855) and up to (670,760). No jumper pixels may sit inside the jaw outline, because the layer renders on top of the head.

Fabric must reach every canvas edge below y=870 so no coat shows through.

Variants: 1 cable-knit oversized jumper with brass elbow patches; 2 ribbed turtleneck rolled below the jaw; 3 chunky knit with gear intarsia pattern; 4 baggy hoodie with hood down, bunched as a collar around the neck below the jaw, brass-tipped drawstrings; 5 zip hoodie with brass gear zipper pull; 6 patched hoodie with riveted leather pocket; 7 raglan sweatshirt with copper piping; 8 Fair Isle jumper with cog motif; 9 knit vest-over-jumper with pocket watch chain; 10 baggy jumper with a buttoned-up open-collar shirt peeking at the neck, shirt fully closed with no gap; 11 rare: moth-eaten jumper whose holes reveal brass clockwork ribs, drawn inside the layer; 12 legendary: iridescent teal knit with glowing gem-studded brass collar.

Only clothing pixels; everything else fully transparent. Write artifacts/jumper_01.png .. artifacts/jumper_12.png and artifacts/jumper.json: an array of {"file","name","weight"} with integer weights summing to 100, with rarer variants weighted lower (11 and 12 at 3 or less). Write artifacts/jumper_01.png .. artifacts/jumper_12.png and artifacts/jumper.json: an array of {"file","name","weight"} with weights summing to 100, rarer lower.