The serpent's charms

This is the fastest charcoal portrait I have ever done, it took me only 1h! I think it's because I decided not to shade the face (I liked the strong contrast) and because I didn't measure the proportions.

There are some thought's about the meaning of this drawing but I wont bother you with them, I think the title says enough

I found the reference for the woman in 's gallery, a very beautiful photo [link]