There were many different design versions drawn for the Witches of Morva in The Black Cauldron.
Artists like Milt Kahl, Mel Shaw and Tim Burton all came up with character models that represented their individual artistic style.
Milt"s witches reminded me of Madam Medusa and Madam Mim, two characters he had previously animated. Tim of course drew the trio in his wonderful outrageously avant-garde style.
By the time I come onboard, I took bits and pieces from these earlier approaches and came up with this look. I believe this what they ended up looking like in the film.
I drew a few scenes with the Witches, but Dale Baer was the one who showed real polish in his animation.
Heritage auctions is currently offering these sheets from the film's producer's estate.