Gnawling the Roots Picture

In the Norse Mythology, the world is set in a giant tree named Yggrasil, the branches extends to Asgard, and the roots to the Niflheim. There, there's an ancient giant dragon named Níðhöggr, whom gnaws its roots forever, until the arrival of the Ragnarok


I used tempers for the colors, scanned it, and then made the details and retouched it in photoshop cs2

Previous sketches:

Drinking Contest
Gnawling the Roots
A Frost Giant