Pratchett's Witches Sketches

Just re-read Terry Pratchett's "Witches Abroad", and felt an urge to try to create their faces. Damn Paul Kidby - even though I was drawing completely from my imagination, I still found myself turning out Kidby-esque images. He's either completely infiltrated my imagination, or he has nailed Pratchett's characters so well that there's just no avoiding him.