Great work! The only suggestion I have is that I think the formation of the dragon "breath" needs to be reconsidered. In my opinion the "breath" is too wispy and delicate to be coming out of such a tough looking beast. If your intent is to have the dragon breath be a cloudy wispy sort of breath then that's cool, but I think it has to have fewer curves and should appear to at least initially come out of the beast's mouth/throat with more force. The watermark makes it a little tough to evaluate the head , but from what I can see it looks pretty cool.