the anatomy isn't exactly 'correct' proportion wise, but it seems like mostly your doing that intentionally. If you weren't, then some quick things to point out; his deltoids are abnormally large and irregularly separated from the torso (namely the pectorials), his shoulders are a bit too wide even for an exaggerated character such as this, and his lack of neck has some issues design wise. The rest of the character obviously isn't finished, so I'll hold my comments about it.
this actually reminds me a whole lot of Roc from the Miuchiz project I worked on... character design was already made for me, and the style is quite cartoony, but maybe it still might help you a bit.

heres an edit. I lightened up your darkest colour just a tad and fixed a bunch of anatomy stuff.
