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... I got nothing. My searches of Amazon haven't been much luck yet, haven't hit on the right combination of keywords.
It wasn't Roald Dahl's The Witches, was it? It doesn't quite fit in with what you're describing, but there are some similarities. It's probably not what you're looking for...
No. I'm familiar with The Witches and this wasn't it. :) No mice, no saliva as ink, no baldness. Also, the drawings were a bit more detailed, at least in some places. I remember the drawing of the witch putting her chin on her chest was realistic-looking line art. I remember the scene in the grass where the boy is looking at the house as being more sketchy.
Found at https://scifi.stackexchange.com/a/191750/23243
, "Walker, the Witch, and the Striped Flying Saucer" by James Stevenson
It was a book, released by 1990 because I remember reading it as a kid. The main character was a boy who visited a house peopled by a witch or witches (I want to say that it was three witches). One of the things pointed out in the book was that witches could be told by their double chins, which they'd encourage by placing their chin on their chest (I seem to remember there was a picture of it in the book with one of the witches with her chin on her chest and looking up at the reader. As a child, it inspired me to practice until I could get my chin to do the same). At some point, the kid's walking through a field of grass towards their house (for some reason, the grass sticks out in my head) and the witches give him fantastic things (I want to say, again, three) of which at least one of them was a flying automobile in return for... something. I want to say his soul or for him staying with them forever. Except that a man (I want to say he had a beard and twinkling eyes that were pointed out in book) instead showed up and took his place.
Very odd little book from what I remember of it now. Oddly enough, I largely remember it because of the chin-to-chest thing, and in part because looking back on it, I get this strong feeling of the man who sacrificed himself being an analogue to Jesus, sacrificing himself to save this child who got into the situation due to his own greed.
^_^ Any ideas?