Wow, this drawing sure looks like one of those paintings that has two meanings in it. As PhantomWatcher pointed out, it looked like the side view of a dragons head. I saw this too, but I can also see the body of a woman lying down, and looking at us (no wonder the artwork has an M-rating, haha). Very clever.
This is a pretty good example of an optical illusion. Hope you'll be making more of these types of artworks!