Dude, that's epic!! Thor fought the midgard serpent, I think in the 60's or 70's, not sure. It was the old old comics. Though the modern day version of the serpent, aka Fear, brother of Odin, Fear itself, was a damn letdown.
Your artwork however is uber, I love the angel, the sense of scale and that we've just intruded on a moment of intense action!! Excellent artwork. Thor is like my favourite superhero!!