I'm removing the AI generated art from my 24XX modules and using images from the actual series. So far I've updated the three modules named in the post title. The rest of the modules I'm updating as I go along, and aren't currently available.

https://itch.io/c/5637431/24xx-scenarios

Question for the audience: The original Conan stories by R.E. Howard describe a character that doesn't look exactly like the Marvel Comics version, or the Arnold version from the 80s movies. The Conan module is based on the Howard stories and will probably have 3-5 images in it. What version of Conan should I use in the module?

I am not a lawyer! That said: I’ve heard the rights holders for Conan may be a bit more on the litigious side, and  there’s a recent RPG adaptation under official license by Modiphius. So—just to be safe—I personally would use a name other than “Conan” (and say “inspired by 1930s sword and sorcery pulp fiction, including R.E. Howard’s Conan stories” on the page). Then I’d scour public domain art resources (like comics and pulp magazines at Comic Book Plus) for anything at all that screams “Conan” to me, favoring things that match the “feel” of the game. 

Thanks for the reply! I'll tread carefully!