Here's a little of what I recall from Mystique's history at Marvel:
My first awareness of the character was as a villainess showing up in the background of the late 1970s Ms. Marvel comics that ran for about 2 years before getting canceled. She made only one appearance in a cameo role while the heroine was fighting the villain Gro-Tesk (a one-off X-Men villain whose first appearance had him "kill" Professor X during the mid-1960s). I didn't see her again until she resurfaced in the "Days Of Future Past" story arc in Uncanny X-Men #141-142 a few years later, leading her own version of the Brotherhood of Evil Mutants.
A formidable opponent for any hero, given her abilities, and how she managed to use them to insert herself into a position of power.
Just a critique but I would have made the right leg the one that was morphing along with the right arm, with her leg almost entirely turned into the knocked out dude's leg. Just a thought, obviously the piece is done.