I want you to choose one of the photographs and begin to reproduce it as accurately as possible in pencil only.
At first focus on line. Don't worry about shading until you have your lines/shapes finished. We will be spending more than one day on this drawing so don't try to rush through and "finish" in one 15 minute session.
Just think about the figure in this exercise. I don't care so much about the background, and intentionally picked images with, basically, nothing there. Cheers.