From Marvel Comics, mystique is the shape-shifting leader of the second Brotherhood of Evil Mutants. Unless you watch the X-movies in which case she somehow becomes the leader of the X-Men.
C'mon, Marvel! She's obviously evil! She literally calls herself the leader of the Brotherhood of EVIL Mutants. Where's the confusion. If someone calls themselves evil there is not usually a lot of moral wiggle room. Even Charles Manson didn't consider himself evil.
Anyway, enough X-rant. Firing twin pistols while in a long cat-foot stance was a scene from the movie Barb Wire starring Pamela Anderson. I remember nothing about that movie, just this pose from one of the commercials.
Here is the time lapse video of my QuickPaint method:
And here is the B&W line art version: