E-Man's Sprite R & D

[Kelvin]

I think the goomba looks best without the AA. As for the pipe, the first one looks banded around the highlight, and the long sections of a single shade make it look faceted. I'd maybe mess around with dithering to soften it, although that might take away from the metallic look. But parallel dithering doesn't seem to work either, so I dunno. Your pick.