I like the way you broke the traditional idea, looking for a less repetilian form, and with more features of bird of prey. Its shape reminds me of a cross between a vulture and an iguana.
The atmosphere and the lighting is very well done, making the dragon stand out a lot. Also achieving a good set, because the backgraund is neither too simple, nor is heavily loaded with details, in the right spot (I'd say) with a minimum to present the creature and a maximum to tell a little more of it.