Amazing artwork and a very interesting design, although I can't get over how inefficient his weapons and armor would be. I know it's fantasy, but still, I always prefer things at least making a little sense X3
I really like it; however, the wings look incredibly flat, as does the hair. The lines you've kept on the picture make it look a bit more 'sketchy' than an actual finished product--I'm not sure if that's what you were going for or not.
Also.. where is the pink ambient light coming from on the weapon/armor and skin? You do that a lot but it makes it look awkward because there seems to be no real source for it.
It looks a bit awkward at times because its hard to see where that light is coming from. It might also be because sometimes its that warmer light on a cool-colored image. I might suggest doing it with a blue or green or some such for the cooler colored images.