There's no right or wrong way to do this becauseit's your picture and you're in charge but to get some tips you could look at the work of some famous collage artists such as Kurt Schwitters.

How do artists make collages? A collage is a piece of art made from different pieces of paper, photos and other materials. Collages also might have painting and drawing on them. Collage artists ...

He also highlighted The Gettysburg Address Collage, his first history-based ... Then he became one of the most famous artists that ever lived.” The event was made possible through support ...