At 1x it looks wonky, and at 2x a lot of the wonk starts looking appealing to me. Sumos remind me of Everyone Loves Katamari Damacy, and the wonk reminds me of its wonderful wonky art.
Just to say that I like it.
At the same time I also think you want to know that alot of this IS wonky, AA reinforces banding rather than smooth things out the way you've done it in a lot of places, you've got a single pixel of background color right next to his shoulder, why?
Same goes for his head having a brigter color as an outline, why?
Aaaalso he doesn't really look fat. I don't know why. Give him more thighs.
Yeah, and about that, lighten up the edge of his manties, you read it as his back and then he looks even less fat. And you said he is.