Nice concept, but in my Christian opinion you should've given him a much more muscular body to symbolise the superhuman angelic power that Azrael would possess. The characters slim figure just makes him look wicked to me. Kind of like a degenerate drug addict that hasn't eaten a proper meal for a year. It's still a nice piece of art in all its wickedness.
Gorgeous! I love the intense detail you put into this and the dark colors put such a dark mood to it. All of this together brings to the table exactly what emotions you intend to convey. Very nicely done.