The Mishibizhiw is a mythological creature from the Native American societies around the Great Lakes region of the U.S. and Canada. It's both a creature of the water and the underworld; behaving much like an alligator or a crocodile by dragging men and women into the water to devour.
I was looking up native american mythological creatures to see if their bestiaries included draconic creatures. I thought this guy sounded a lot like a native american version of a wyrm.
Edit: Been wanting to do a rough touch up of this guy for a while. Changed his face a bit, added more contrast, reworked the lighting a tad. Now onto new things!
I mentioned the changes in the image description. Upped the contrast, went over the lighting on the critter, fixed some things in the face. Minor changes really but I think they help the image.