When I saw this, I had to say Yor Toor Shol... those darn shouts have corrupted me. Anyway, I like how the fire looks like it has a sort of molten component to it in addition to the flames. I have to ask, though: why does everyone draw Dovahkiin with the same crappy armour? Dovahkiin would not be stupid enough to go against Alduin with Iron armour. Why not draw him/her in something that looks cooler, like Ebony or Daedric? Or, if you wanted sort of an ironic fight, outfit Dovahkiin in full Dragonplate/Dragonscale when he's going up against a dragon... fighting him wearing the bones and scales of his fallen comrades has to be insulting.
Regardless, awesome job on this piece, and the speedpainting was great to watch as well.