Veeeryyy nice shading going on here! You really put in a lot of effort shading in all those feathers (painpainpain), and also getting the crow's beak size and overal anatomy right! My only comment would be the tank itself; the texture and shading you attempted to apply didn't quite turn out right...seems a little flat.
But otherwise, beautifully done. :3 I love the crow's army hat. XD