I will never forget the first time I looked through a 35mm SLR camera. At 10 years old it was like entering an alternate reality. It was amazing to see that even though the viewfinder has a restricted field of view, there is incredible control of it. I had discovered composition. I would spend hours (and still do) analyzing everything I would see. I hated geometry in high school. I love it now. Composition is a bit like playing pool. The art is in the angles. In the many years of swinging a camera around my neck I have never tired of trying to find another angle. A new way to see something you see every day.
The idea behind this shot was for me to be part of the photograph showing a bit of the mechanics of capturing a portrait. By shooting over the shoulder of the subject we create a visual sleight of hand. The subject in the center of the frame demands the attention of the viewer but there is also tension to draw the eye away towards the left and right of the frame. The center of the frame carries the power of the photo but is just a reflection.
By cropping the left or right third of the image out you can create other interesting images.
Crop into the center of the frame and the image now looks like a portrait photographed facing the subject.
A photo such as this breaks a few rules of composition and one of the reason why it is so much fun to create.