Quick crit: will he be using that back claw on his feet for walking/balance? If so, it might need to be flatter and more stubby. Maybe bent the other direction when he's perched or standing. In your sketches, it looks like he uses them for some support rather than just grasping like a hawks talons..just 2 more cents onto the pile. The model is awesome by the way!
"It's supposed to be hard, if it was easy, everyone would do it."