The feared Nidhögg

My entry for the 20th Art challenge of DigitalPainting.School about pirates ! It was a concept art challenge and we had briefs about concepts, among them I chose the Nidhögg because I love to paint dragons.
So, for this creature, due to the fact that it is part of a viking faction, I've chosen to make it similar to a drakkar (famous viking boat).
This challenge was a great opportunity for me to try Zbrush, I have used it one or two times before. It was very pleasant to sculpt this creature !
On the final illustration, the Nidhögg lands on a boat hull after sinking it. Drakkars in the backgrounds come to him to continue the battle against an opponant faction.