This photo represents value. In this photo you can see the highlights where the sun is shining on her and the shadows where it doesn't. The darker areas show more depth than the highlighted ones. (photo by Sarah Loven ) Idea of using shadows
I like the idea of using personal props in senior photography. I think I would like to see a version of this where she was actually playing the guitar and her body was creating some angles in contrast with the horizontal lines created by the stairs.