Enchantress is a Marvel villainess, longtime enemy of Thor. Apparently not popular enough to warrant an appearance in any MCU movies as of yet. She's basically a female Loki.
Created using Clip Studio Paint Pro on a Surface Pro 4. You can follow along the QuickPaint process in the time lapse video below. Including how I phone in the background buildings with some random geometric shapes. Including that big dome in the background making this look a bit more like Attilan, the home of the Inhumans than it does Asgard.
And here is the B&W line art for those of you that are fearful of 3D rendered images attacking them at night. Hey, it's Asgardian sorcery... anything could happen.