Thanks for the feedback. I am currently working on the branding, this is definitely something which needs to be done. Good point about the photo of the poster from an angle. Will take the above on board. Thanks again!
Also, build up the product. Say something in the descriptions like: "This poster is made to original specifications, just like the posters made 60 years ago when they changed the course of history." These posters are a niche product. They don't fill a need, they fill an emotional desire to connect with history. Build on those emotions. Some posters will sell themselves, for the rest, you have to sell them.