I've been watching your DA gallery for a few years now, so it surprised me that the thumbnail for this painting had your name next to it. Unless it's just cause you've been hiding it from the scrutiny of Deviant Art, I haven't seen this caliber of work from you before.
I automatically like almost anything with dragons in it, so you have that going for you. Otherwise what I like about this the textures on this creatures' horns and scales, which are all exquisitely detailed. I also really like the purply-blue color scheme, which is both soothing and mysterious.
I guess the only thing I can pick on is that this is a fairly simple portrait, so it's not like you're showing this creature interact with any other flora, fauna, or people, which is somewhat of a shame. However, it's OK to decide how far you want to go and stopping once you reach that point. For a simple portrait, this is breathtaking.