Looks good, you have a cool style going with your shading. A couple things I'll point out though, I don't really like the face all that much, part of that is because it doesn't feel structured enough like wormskull pointed out. Most of all though, it doesn't feel like it has any weight. I think you should put some strain on the muscles and the belly sag a little or possibly make it thinner near his legs (like a dogs anatomy, but that's personally what I base dragons anatomy off of a little bit so that could vary). Since the front of his body is going downwards, there would be a lot of stress on the front legs and he'd have to bend them a little for stablity.
Looks promising. Everyone seems to be in a dragon mood right now, I normally don't draw that many dragons but they're littered all over my sketchbook right now. | 
