Nice artwork. I guess you need to work on the dragon teeth. I suggest it to make curvy and sharp to it the texture look that it can rip things to shreds, kay? Next one is the mouth. With the teeth, you should add the details of the gums, especially if its a snarling look. The other details are very nice including the shades to make the texture seem real. It also seems to be in some kind of vortex? You have a talent in drawing dragons and just keep doing it and you'll improve a lot. Good luck, mate!