How does the preview match with the avatar?

Lots of stray pixels leaves bad impression. Piece looks broken. Pixels like clusters, they don't like being like sand spread all over the place.

 Cool, but there's a problem: Do not place AA with transparent background, if that's what you tried to do.

The animation is a bit "stop-motion". Should flow more, more frames and more speed ( more agility , ninja! )

And, to be even better, could add movement on the wings and on the guy.