At top is Burning (Jove, May 1978), and it is easily one of my top 10 paperback horror covers: I love the blood-red title, the terrified women screaming, the house ablaze, all within a half-cube. And add that tagline - "A love that defied the grave"! Man I can't resist. Maybe one day I'll read it!
The artist herself, c. 1970s one presumes