Niiice image! The anatomy and coloring is very good - and I love those little fur tufts on his knees. Those battered wings look very nice as well - makes him look like a warrior dragon, it does. That roaring expression is very well-done as well, though I do have one critique on his mouth - he has no gums, and the far teeth look like they're kind of just floating there. The near teeth look very nice though, and I really don't have any other critiques to offer. That's an awesome rock he's sitting on. ^_^
Keep drawing!
Great job on the dragon, you did perfect on the hands and feet, and I love the head.