The doll's head in a circle, carefully drawn hands at the piano, and eyes closed in repose reminded me of a favorite cover for a book I have been unable to find cheaply, the intriguingly titled A Feast of Eggshells. Somewhere in my searches I discovered another similar cover and noted that signature, then began to track down more by Heindel. Which is how I discovered that he's a world-famous painter of ballet and other dance, whose artwork has been collected by Princess Diana, Andrew Lloyd Weber, and George Lucas! Claaaaasssy for a guy whose earliest works appeared on these "easy-to-see large-type" Gothic/occult paperback originals. I love it!
I found five other horror covers from Heindel: Neither the Sea nor the Sand, Suffer a Witch, Along Came a Spider, The Ouija Board, and The Devil Boy. Personally, I think these are simply wonderful, as they feature all the signifiers of genre works of the era: creepy kids, eerie witches, haunted houses, Rosemary's Baby. If anyone knows of other covers he did like this, please let me know...