I'm not a fan of the deformed chibi sprite style, but it's well done. I particularly like the palettes you're using for clothes. That said, yeah, the obese guy definitely needs more texture in his hair. Maybe try adding some random pixels to break up the smooth highlights or draw in some strands. Also, the way you've shaded the belly and the strap make him look less fat, but I gather from the filename that it's the obese template. I'd try putting more of a highlight on the strap around where his belly bulges, like connect the two highlights you currently have or something.
Edit: Oh, whoops, I see that you already did that. Yeah, the hair looks much better now, but my comment about the belly stands. It's not that noticeable, though, and you did improve it.