A lot of painted film posters are like this, e.g. Back to the Future posters are all actual posed photographs used for the painting. (probably all the Star Wars ones too as the artist is the same) p.s. BTTFIII poster has Mary Steenburgen cut out and glued onto it later as she wasn't on the original poster that was painted.
https://en.wikipedia.org/wiki/Drew_Struzan
https://www.reddit.com/r/OldSchoolCool/comments/ejsb22/micha...