I am thouroughly disgusted by this image especially some of the details. ANd that is precisely what makes it such a masterpiece. Something that is so blatantly repulsive without any attempt to sweeten it up, so plausible and consistent, deserves an applause. I love the needles on her face - awesome detail!
The needles adds a "Coraline" Angle. A witch that lures children in with candy and other assorted goodies with a sowing-theme. You know what? You should do the Other-Mother. Give it that incredibly detailed, grotesque look you give the witches and dragons you make.