I've created artifacts/image.png: a 512 × 512 PNG of the cobalt bear, drawn on a 32 × 32 grid and enlarged 16× with hard square pixels. I looked at it after each change. A script also confirmed the size, that every 16 × 16 block is a single colour (so no blur or anti-aliasing), and that it uses only the allowed colours.

What the image shows:

• A front-facing cobalt (#6f7fe0) bear bust with round ears and bubblegum inner ears.
• A visor across the eyes: a phosphor top band and a moss lower band, with steel hinges and a small bone glint.
• An antenna: a steel stalk topped by a phosphor bulb.
• A bone muzzle with a black nose and mouth.
• Tangerine overalls with straps, a bib, steel buttons and a rust pocket. The shoulders reach the bottom edge.
• A black outline around every shape, on a solid #0c1610 background with five small moss-green specks.
• No text, frame or border.

Possible gaps:

• Collection match: I couldn't check how well it fits the 787-piece set because no example pieces were provided.
• Outline thickness: the outline is one grid pixel wide (16 px in the final image), which is normal for 32 × 32 sprites. If "thick" means two grid pixels, it would need redrawing.

I made the image with a small Python script rather than the image-generation tool, so the colours and pixel edges match the spec exactly. The script (tools/gen_iu_0336.py) and a README.md recording the size, format, colours and these gaps are committed. The image itself is not committed: .git/info/exclude already ignores the artifacts/ folder, so it doesn't show in git status, but the file is on disk.