Wow this is really cool. It reminds me of Lord of the Rings when they were in Moria and Gandalf was fighting the Balrog, it's one of my favorite parts of the movie, so that's a good complement from me! May I suggest putting some sort of shape in stuff like this? or some form or shadow. I know nothing about these color things, but I think it would make them more interesting. Other wise, to those of us who dont do them, all we see is a bunch of lights and shadows, and I know coming from the artist, there's probably more to it for you. But if the lights and shadows were makeing something (say a horse for me, b/c that's what I love) then we would have something to go on and then we would want to look at the detail...thus makeing us fullveiw your work. I hope that was a helpful comment for you! Good luck!
Gj rafe, looks really nice with the coloring.