But in case this point wasn’t made before, 1 single panel won’t do much in a room, unless it’s right next to your head.
As part of a system of 6-10 panels, each does a part of the work. So as part of the entire room treatment, you may want to just keep the poster, and may be use museum quality plexiglass to cover it. It will be lighter than glass, look 99% as good and be a little less reflective. Compensate for it’s reflections by adding panels and diffusion elsewhere.
Art panels make the most sense when you are getting a series of them made. Like, if you had a set of movie posters printed, then you could set up 4-6 art panels and they'd look great.
Best,
Erik