Can do real, but i would use a plastic one. you can buy mod podge at craft store or mix of elmers glue and water. rip pieces of paper, place on pumpkin "paint" them with modpodge or glue mix. they will stick to pumpkin and to each other. you can layer with one last coating of glue mix or wait until dry and spray with clear lacquer or fixative.
Hi Lisa! Here's a very pretty one. https://www.hometalk.com/10115689/decoupaged-script-paper-pumpkin-a-catalog-knockoff
This is a good tutorial: https://www.snazzylittlethings.com/diy-painted-pumpkin-ideas-with-decoupage/
Put glue on it then put your picture on it then keep going