This caracther is called Quimera. Her tale is that she, in life, sold her soul to a demon in order to be beautiful, and she were... for ten days, when she got terribly deformed in a car crash. When she died, she was turned into an assassin as the contract dictated, harvesting spirits to her master's collection. I drew this with a black aquarelle pencil, as I was out of regular resources at time. I guess that what I really like about this is that it ended up decent, even tough I could not erase while making it, so I had to get it right in the first time, or never at all.