Frankly . .
This one was actually done during lighting setup and test, with dramatic lighting effects added in processing, later.
My cousin, Frank, was in need of fresh headshots to update what his agency sends out, and I was asked to make them.
Now this isn't what an actor's headshot really is, but it looks so much like a movie still, that I gave it some Hollywood magic to take it Just a bit further toward the Dramatic.
AlienBees strobe in softbox, giving a downward wash mainlight; Interfit 300ws strobe background light from down low; suspended Vivitar 283 through a snoot for the hairlight. Using Lightroom localized brush adjustments, I created the narrow vertical light areas on his eyes and cheekbones, and the overall exposure was adjusted downward for extra drama. Cropped for simulated widescreen format, then exported directly out of LightRoom.