Very lovely work! I agree, the orange is very complimentary to the blue of Mystique's person. I love the details and the depth of colors.The only thing that I can think of that might need a little improvement, is the shine of her hair. But it really isn't a huge deal deal. Great job in all. This is beautiful.
I agree about the white on her head, but I got tired and just left it as an "overexposure". Drawing the lines and such for hair doesn't hold any sensuality for me, which is probably why I don't like doing it and leave it as "blobs"....I call it style and throw myself on the mercy of the court. .
Either way, it's still gorgeous.