Does anyone know the artists who painted these horror film novelization covers?

[Most Horrible]

Sometimes the illustrator is noted on the verso of the title page or the back cover. Unfortunately not all publishers do this so having to search for a signature on the cover If any) or find folks who are familiar with the artwork...i.e. UMAers in this post, who come to the rescue! Love all the covers posted here! The two Hammer omnibuses look like interesting reads.