There are notable differences between this original painting and the printed cover — the science fiction elements have been added on the published version. Ziff-Davis often added such elements, changing one aspect or another of a painting in production in the printing stage, and most likely they added the wings to the horse, changed the hat to helmet with horns, etc., in the production stage.
This entire issue can be downloaded here
Funny, Philsp mentions 3 different artists (but not Rod Ruth, not precisely his style) :
Robert Gibson Jones, Julian Krupa and Malcolm Smith.
Incidentally, the art matches perfectly the one of Robert Gibson Jones, see for exemple :
https://pulpcovers.com/princess-of-the-sea-1947/#1
https://pulpcovers.com/the-ice-queen/#1
https://pulpcovers.com/the-star-shepherd/#1
(Krupa must have done the back cover and Smith the repainting, let’s say).
From the contents page of this issue:
“Front cover painting by Rod Ruth, illustrating a scene from “Outlaw Queen of Venus.” Back cover painting by James B. Settles, illustrating a scene from “Appointment with the Past.” Illustrations by Julian S. Krupa; Virgil Finlay; H, W. McCauley; J. Allen St. John; Robert Fuqua; Magarian; Rod Ruth.”