Golf trophy photo

I have 2 photos of customers who recently beat me and won a challenge golf match. The 2 photos were taken on my iphone. I wish to superimpose the pictures onto a "crowd" background. One of a golfing crowd, and the other of a WW2 VE day celebration (I have samples but happy for you to provide anything more suitable). I wish to then print these (open to size and material) to present them to my customers.