Cover for the anthology Basilisk. A confusing cover with a green man fighting a woman. There seems to be a horse jumping from his chest -- that's transparent (so you can see the horse body through him). And then there's the horse... it has twisty horns...

Cover for Sturgeon's collection The Stars Are Styx. Man on boat with many different male and female bodies. There's the three-headed Cerebrus that looks like a bulldog behind him. The boat has a skull for a prow with wings.