the frames look alright but the overall motion seems wrong. like he is flicking his wings rather than flying. this is a very hard motion to pull off. I just copied a castlevania sprite sheet when i had a crack at something similar. have a look at some sprite sheets maybe you will see a way to improve  it if u want to improve it.

really smooth animation

Really good animation. Contrats for your project. Let us see all the piece you have!

Right, I see what you mean

Like, focus more on the feet and ankles more then the leg if you know what I mean. :]
Even the forearms for from where the elbow is could help this muchly.

Seems too solid.

@ Souly: I can see what you're saying about the tail stretching, and I'll probably do that with the leg

@ .Anubis.: hmm...I'll try to fix it

Thanks for the Comments

Perhaps his legs could drop a bit when he flaps to give it a bit more realistic flow.
I'm also noticing severe stretching on the tail.

 Very nice, something about the tail seems off, prob. how it loses its black lines at one point, idk, otherwise its neat.