I reviewed slot IU_0025 and accepted the candidate. The verdict is in artifacts/review.json, which is valid JSON and left untracked.

Checked directly:

• Hash: the file I downloaded has the sha256 45df7f7b…4377, which matches the slot.
• Grid: the image is 512×512, which is a 32×32 grid of 16 px blocks.
• Palette: I decoded the PNG and found exactly 10 colours, all from the allowed palette: background #0c1610, black, cobalt, lilac, navy, steel, phosphor, tangerine, bone and moss. That means no anti-aliasing or gradients.
• Background: it's solid dark, with two small moss-green specks, which the rules allow.

Judged by eye:

• Character: there's one front-facing bust, centred, with the shoulders reaching the bottom edge and thick black outlines.
• Traits: I could see a lilac frog (wide mouth, nostrils, eyes set on the sides of the head), big phosphor-green eyes, and a cobalt hoodie with drawstrings.
• Text: none, and no watermark, frame or border.

The one doubtful trait: the hat has a navy fold-up cuff, which reads as a beanie. But its steel side panels and centre stripe also look a bit like a helmet. I judged it a beanie and took points off brief for it rather than rejecting.

Scores: brief 8, silhouette 9, style 9, originality 7. I named the character "Lilac Hopper".

I didn't write the README the reference material suggests, because the task said to write only the JSON.