The literally iron-fisted headmistress of Gravedale High, the school for monsters in the short-lived 1990 animated series of the same name, mainly remembered for starring Rick Moranis as the main character. Trained from screencaps of the best quality video I could find, which wasn't great.

Tags are: "HM_Crone, blue hair, blue skin, yellow eyes, metal left hand". Her outfit is "Purple jacket, white blouse, earrings, white cuffs, bow, belt, purple skirt, high heeled boots". Might also try "Missing left hand" - That thing frequently came loose.