This is a piece of monster art I did for Stonehell Dungeon 2 (http://www.lulu.com/shop/michael-curtis/stonehell-dungeon-into-the-heart-of-hell/paperback/product-22415728.html) - if you play D&D you should check Stonehell out, it is one of the best examples of a megadungeon ever published.
Medium - pen and ink and pencil