I don't think the size of the arms really hinders the piece. I do feel that the shading on his right arm could use some work; seems like too much highlights in some places, and not enough in others, but that could just be me.
The black and pink contrast nice, and the face looks keen to me.
My biggest concern his is left arm; by the way it's placed, he'd be floating in the air (which maybe you did on purpose

). But if he's supposed to be on level ground, I'd make his left arm resting on it, rather than going through it.
Pretty awesome pic so far though.
Keep pixelling, and carefull with baking all that cake
