Love the face. Good attitude. Allow me to address some fundamental mistakes and close on a purely subjective note.
You've got three different light sources: Wings and tail from the top, face from the bottom, body from the front. Choose one, stick to it, and take it to the end.
Opposite limbs forward. Shoulders and hips point in opposite directions. If the right shoulder is forward, the right hip and leg go BACK and the left hip and leg come forward. Dragon man isn't a model for muscleman magazine. He has no interest in looking cool, he has no idea what cool is. Without insulting him, he's a beast, a brute, an animal (kinda-sorta); Give him a natural stance rather than a pose.
Watch the tail. Wings stem from the top of the spine, the tail from the bottom. If he's bending forward, towards us, then the tail's base is BEHIND the wing. The tail goes back from there. While it's technically possible to bend the tail to this extent it's highly unnatural.
Careful with rendering. Detail draws attention and you're drawing attention away from the face and body to the tail.
On a purely personal note, I find your version to be elongated and skinny. He could use an extra ton or two of weight. The body and tail are essentially a single unit (think T-Rex) the tail's base should be as wide as the body.