Here is Hela, goddes of death in the Norse mythology and one of the best evil character that appear in the Thor comics in my opinion.

I've went for the classic costume, but with some improvements and details from other versions. The base figure is Invisible Woman, as she is slightly taller than standard ML woman, with Legolas hands, Legolas sword with resculpted handle, LOTR cloak, LOTR waistpads, and finally Mystique head heavily modified (I can't believe a so awful head can have a good use!)