Imho, ask to the commissioner if he would agreed on letting you post 1 page to cover the commission slot. And then maybe upload every page as a single upload. That way it wont take you forever to upload that massive collage and at the same time you show the entire commission. But again, its my opinion and I alwasy ask the commissioner what he wants to do. Cya, wish you the best.

thank you copykat, you really helped me.