Place the subject near the only light source, natural or artificial, helps if it's smaller. No ambient light in the background, or it must be much darker than the subject. Pay attention to any light reflecting off of walls, ceilings, etc. To get that deep shadow effect on the opposite side of the face, use a large piece of black foam core board to block any reflected light that may illuminate that side.
If you think of light as something like water spraying out of a garden hose, it helps to predict it's effect. Small hose = low volume = less water spraying around and getting everything around the subject wet also.
With darkroom printing, it's also possible to burn in the background enough to give a similar effect.