Yes, the hands should be angled a little differently and the guy's head is a smidge too small... But who cares? Wow, that's an awesome image- I love the poses of the birds, and the concept as a whole. Is this india ink? If it is, the shading is phenominal, considering how hard it is to get tones perfect in that medium. I never see any really nice pictures done in india ink, so it's always a treat when I do. ^_^
Love the vulture, the owl and the pelican- although the penguin's pretty trippy too.