My proposal is based on a conservative intervention. I think changing the finishes, both floor as painting the walls, you can get a significant change.
I propose two options for distribution. Although most of the intervention is common to both options, there are some different details in each of them:
Option1- Two custom-made furniture have been placed on the side to expose the posters. They serve also as tables furniture.
Option2- There are two tables placed in the middle of the store. To display the posters I have maintained the existing structure but they are lacquered in black.