nice!
i love the amount of detail you have used in this art piece...
I also like how you have made his face and neck look almost completely patterned too. It's a really good use of textures and i love the boldness you have used to frame the dragon.
I agree with Aci6 in regards to adding something in the background, you could've used lightning, but i think something like a castle in the distance would add to the fantastical characterization of the picture and also highlight the size of him adding the sense of power :)
but yeah.. nice work.