It's the new MP ending sprites. Your character smiles when they win, and don't when vice versa.

I will make proper sprites for them sometime (no guaranteed date, this is a fairly ambitious job) since the menu ones clearly aren't made with the sprite pallette in mind, leading to scratchiness and characters looking darker than they are meant to be.

I was going to tweak the pallette swapping of them to make them more accurate, but then was like "What's the point if I can just draw some myself?".