Well drawn
I like your style and your rendition of Mystique. Without a doubt one of the most annoying and coolest characters of the series.
The coloring you did is great, especially including the shading. I really like that you added texture to her skin, making he look less bland. The scales too look very good.
I could ask for a background to go with it as well. Her left eye looks a bit off and her hair seems unrealistic.