Portraits of Men - The second backlight
I've added the third light. This time down low on the bright side of the face. This is a smaller Smith Victor Light with a set of barndoors on it
The light is skimming across Bob's right cheek and creating separation from the background. You have to be careful at this point that you don't get lens flare. Use a lenshood, because the two backlights are shinning straight into the lens.