one correction, though it looks better like this so i wouldn't change it, but according to Norse mythology, since he was both a serpent and the son of the fire god, his coloring was different than expected. His belly was a bright yellow, his sides the color gave way to a deep burning orange threaded through with line of black that grew denser and closer until they formed a broad, inky stripe on his back. his eyes were points of "red fire" and his fangs were the color of polished ebony.
The only problem with that coloring is that it loses the dark, foreboding effect, so i wouldn't change anything.
The intensity of this is mind boggling...what a fantastic piece! I adore the way you made the water look like it is sloshing about, I can almost see him undulating under the waves and tossing that ship about, wonderful.
Really nice drawing, I like mythology, as I see you like to draw it, you know the legend of the jormugandr is in three different mythologies: norse, mexican, and spanish...The water, boat and expression on the beast are really realistic, very well illustrated...