Fun concept and design! I think for the hands, extending the length of the fingers and increasing the pixel height to the level of the thumb would help.
I like it :3! (foo fighters <3 xDD) look a little weird the arms, and pants very flat. but i love the desing.
I really dig the style! I do think it needed a bit more of work in the lower part (perhaps a stamp or something that would help with the volume, like what you did on the shirt).
I think the anatomy looks fine.