I made artifacts/image.png: a 512 × 512 PNG (8-bit RGB) of the steel frog in a hoodie. It is not committed, so the daemon can upload it.

How I made it: I drew the frog by hand as a 32 × 32 grid of pixels in scripts/make_iu_0484.py, then scaled each pixel up to a 16 × 16 block. Pillow isn't installed, so the script writes the PNG with plain Python. I didn't use the image-generation model, so there's no anti-aliasing, gradient or blur.

What's in the image: one frog, facing front and centered, with steel #8a8f96 skin.

• Big bone-white eyes with black pupils and highlights.
• A black antenna topped with a glowing phosphor bulb.
• Pink cheeks and a wide smile.
• A cobalt hoodie with a navy hood opening, white drawstrings and a pouch pocket, with the shoulders running off the bottom edge.
• A black outline around every shape.
• A solid #0c1610 background with four tiny moss-green specks.
• No text, logo or border.

Checks:

• I decoded the PNG and confirmed it is 512 × 512 and uses exactly 9 colours. Eight are from the brief's palette; the ninth is black for the outline, which the brief requires.
• I also looked at the rendered image.
• I couldn't run imd-media ffprobe because ffprobe isn't installed here.

Unmet requirements: none that I know of. Two judgement calls and one gap:

• The outline is one grid pixel thick (16 px at full size), the most that fits a 32 × 32 sprite.
• The hood is down around the neck rather than up, because the wide frog head fills almost the whole width.
• I couldn't check that it matches the rest of the 787-piece set, because no example pieces were supplied.

I committed the generator script and a README.md that records the size, format, colours and these limitations.