I've made the IU_0553 portrait and saved it as artifacts/image.png: a 512 × 512 PNG (8-bit RGB) of a lilac bot wearing a visor, a bandana and a jacket.

Instead of using the image-generation tool, I wrote a small Python script that places each pixel on a 32 × 32 grid and scales it up 16× with hard square edges. That keeps the grid, palette and outlines exact. Re-running the script makes the same image.

What the character looks like:

• Head: a rounded lilac head with cobalt shading and pink cheeks.
• Visor: a dark green band with a bright green glow across the eyes.
• Bandana: red with white polka dots, knotted on the right with one tail hanging down.
• Body: grey ear bolts and neck, and a blue jacket with navy shading, an open V-neck over a grey undershirt, pocket flaps, gold buttons and a gold zipper.
• Composition: one bot, facing front, centred, with the shoulders running off the bottom edge.
• Background: solid #0c1610 with six small green specks. There's no text, frame or border, and no U+I logo because the outfit is a jacket, not a UI TEE.

What I checked:

• File: ffprobe reads it as a 512 × 512 PNG.
• Colours: it uses exactly 12 — the background, black for outlines, and 10 colours from your palette. There's no smoothing, gradient or blur.
• Grid: every 16 × 16 block is a single colour, so it's a true 32 × 32 pixel grid.
• Look: I viewed the result twice and adjusted it. The first version had a thick black band between the bandana and visor, a hidden neck and a cluttered knot.

Limitations:

• Black outline: black (#000000) isn't in your palette, but I used it because the style rules require black outlines.
• Matching the set: I had no other pieces from the 787-piece set to compare against, so I couldn't check that this one matches them.
• Style: drawing it in code makes the style simpler than a hand-drawn sprite.

I know of no other unmet requirements.

The script (scripts/make_iu_0553.py) and a README with the size, format, palette check and limitations are committed. The image itself is untracked for upload; the repository's local exclude file ignores the artifacts/ folder.