I was mostly thinking of how painters, sculptors and cinematographers presented them, since those images are more specific (in relation to what an author describes, which to some degree is open to different visualisation)
(by the way, computer game depictions of aliens can be posted too).
I will start the thread with one of the most famous artists who created work about aliens, HG Giger
You can post any depiction of an extraterrestrial, provided it is in the form of a drawing, painting (or painting-related art), cinematic, or sculptural art, and you consider it as interesting
It can be of a being, an environment, or both at the same time (including the alien environment being alive itself).

I will start the thread with one of the most famous artists who created work about aliens, HG Giger



You can post any depiction of an extraterrestrial, provided it is in the form of a drawing, painting (or painting-related art), cinematic, or sculptural art, and you consider it as interesting

It can be of a being, an environment, or both at the same time (including the alien environment being alive itself).