did a very quick and dirty edit

I know proportions aren't supposed to be realistic in this, but I just had to shrink that head. Better to shrink the head then try and rework the entire body, which looks better overall.
Leveled out eyes, put more definition in face
made the wings level around where they should be on the back. As you have it now his left one (our right) is coming out of an awkward place.
Beefed up bicep area a little, it didn't match the thickness of his forearm. Actually in my edit the forearm/hand is still a little too big and his armlet thingy has a curve in it, which makes him arm look bendy, not good. I found this pic that might help on the anatomy.
http://images.amazon.com/images/P/B0000VD12I.01.LZZZZZZZ.jpgOf course you'd probably want to tone it down but it's a start.
I forget what else I did here but I guess the picture speaks for itself. This design and style kinda remind me of an Akira Toriyama design, which is a good thing.