I scoured the shelves at the local thrift shops a few days ago, looking for some cheap horror paperbacks to scan and post in the days leading up to Halloween, but the only one I saw that featured an illustration that I sort of liked was the following uncredited cover for The Devil’s Children, edited by Michael Parry:
[CLICK IMAGE TO ENLARGE]
I suppose it’s possible that the cover image is an early illustration by Alan Lee, though the rendering (in watercolour) is tighter, and displays a much wider range of values, than one usually encounters in Lee’s work. So, probably not by Lee. Unless it is.