Aww. :3 You picked the shades of blue well. And it's cute, too. However, there are a few things about it that look... unprofessional. First off: you copy-pasted the feet. I can see that. Every foot is the same. That, my friend, is being lazy. :P Feet look different from different angles. Also, define the different bones of the leg-- try to show a difference between the ankle and the ulna/radius and the elbow.
Additionally, it would be very uncomfortable for the dragon to hold its tail out straight like that. It would be sitting on the ground. :3
The wings... well, they aren't realistic. What is the purpose of sectioning the membrane if it's stretched out straight? Membranes generally only section out like that when they fold in on themselves or there's another phalange in there. Also, the bone on the top of the wing should be much thicker-- it has to support the dragon in flight, after all. This wouldn't.
Hope that helps. :D