your proportions are a lil off, just by like a tad, not much...sorry, ima give you a honest openion, a lil more work and corrections to this image and it could be really good.
when doin the arms, the elbow should meet right underneath the rib cage, and the forarm should be the length of your upper arm right up to the rist will stop at the armpit. hands very important if you drawm them to large they look goofy and clumsy. try to size em down ...maybe almost a lil more then half that size.