This piece looks great! However, the top of the head is a little blocky! What I mean is that the brow looks a little naturally straight, as well as the snout, and jawline. The shading other the head could use a little improvement as well. Other than that, I see no issues in the work! Your background is fantastic, as well as your body, wings, tail, tail spikes, and shading. ^_^ I hope this helps!
I apologize that I can't write more words or if this doesn't help, this is actually my first critique so I'm not really certain on what I should do.