On the left hand side, my photos were taken using natural light coming from a nearby window.  I took the photos on the f4.5, ISO 400 and 1/320 shutter speed.  These settings therefore allowed me to focus evenly on the person without letting to much light or exposure in to give a nice balanced effect.  On the right side,  I used a reflector to balance the light coming in from the window to be reflected on his face too.  To enhance this effect, I upped the contrast to deepen the shadows.