Smash Sprites!!!

[Kelvin]

Try looking at pictures of fists on Google. Pictures of boxing gloves would actually be helpful, since they're usually shown at an angle that shows how the thumb fits into the fist. Then you'd just have to make it not as thick and draw in fingers that follow the curve, and that should help his hand look better. As it is now, it's too straight, and doesn't seem to fit the perspective of the arm. His background arm also looks too stiff, and like it's bent backwards.