Those are very funny! I can imagine them flapping away angrily with no effect although if he was biting my legs off I'd probably not be laughing that loud!

On the feet it looks a little like he is sat back on his heels and if he rocked forward he'd damage his claws- you might want to make the paws a little thicker at the front where they join the nails. You could also try a few splits to give his 'toes' some definition.

Overall though he's got a great shape to him- coming out great.