Medusa in progress Picture

This is a picture taken by a Canon EOS 100D of the original sketch, which isn't finished yet. I think I'm going to try to paint this on canvas but since I have no experience at all with that I wanted to save the sketch in case it goes wrong.

The image is supposed to be Medusa, from Greek mythology. I want to make a series of women in mythology, in a kinda old skool tattoo style.
Medusa in progress
portraits block 7