Color is too uniform. I'd expect it to be getting cooler as it moved away from his hands.
>>1438749This is also a big one. It's one of those things that doesn't jump out, but makes the image just not look "right."
Oh, and it looks sort of flat. I'm not familiar with the move, but for the fire to be moving like that (sans wind), he would have had to started the punch from above his shoulders.