Very awesome pic, and I love all of the little touches and details (dead animal!), but I can't help feel like the terrain is in fact stealing the show here. The amount of detail in the rocks, the water and the smoke filling the sky seems to dwarf the dragon. The scales are nice, but other than that, our winged friend here feels kinda bland, especially in the... well, wings.
But don't get me wrong; this is still an amazing piece. Just feels a little... incomplete to me.
I absolutely love how you drew the water. It's amazing. Also the rocks and the mountain in the background are very well done. I do think the dragon's wings look a bit stiff, somehow. Furthermore a very nice piece of art. Keep up the good work!