focal point

http://www.digitalcameraworld.com/2013/07/25/using-focal-points-in-photography-how-to-get-perfect-composition-every-time-you-shoot/

This website was helpful because it explains the key issues needed to take a photograph with focal point in mind!

 This photo has Leonardo DiCaprio the main aspect of this picture and he is the focal point. When you look at this the first thing you see is him and the background doesn't grab your attention only he does.  Annie Leibovitz has decided that she wants her focal point to be in the main center of the frame, this was her only sensible choice because she only has the viewer looking at one thing.