As promised, above is the book cover for the anthology "Witch Way to the Mall" edited by Esther Friesner. I like painting silly and grotesque stuff. The editor wanted a sexy soccer mom type witch though (a WMILF?). Can you find the Wizard of Oz allusion? I did it entirely subconsciously. (Hint: a means of propulsion, although not usually a desired one.)
Below is one of my initial thumbnail ideas and three bonus, more traditional, witches I painted for "Wyrd Sisters" by Terry Pratchett many years ago.
Now to go and eat the candy I bought for the Trick-or-Treaters. They're going to be egg-throwing angry with me.