Evil-Lyn from the Master of the Universe. I always liked the evil witch, lurking at Skeletor's background. She wasn't part of the original mythos, but appeared soon after in the second way of toys and in Filmation cartoon. This is more updated look, based on "Classics" look.
I did the original drawing on pen and paper, then scanned it in and did the digital painting over it, enchanting and fixing some details.