As Burroughs readers will recognise (though you don’t need to be a Burroughs reader to spot two moons too many for Venus), this Frazetta scene is supposed to illustrate one of Burroughs’ Mars stories, not this Venus story:
On the other hand, the following scene, clearly intended for one of Burroughs’ Venus stories, is being used to illustrate Poloda instead:
And the low-hanging stone moon in the background indicates that this scene is actually supposed to be Pellucidar, not Caspak:
I’m just sayin’.