Broad light, needless to say, broadens the face, while short light sculpts it and adds more contrast for a more low-key vibe.
In portraiture, “broad lighting” refers to setups where the illuminated side of a subject’s face is facing the camera. “Short lighting” does the opposite; that is, the darker, shadowed side of the face is closest to the camera. Broad light, needless to say, broadens the face, while short light sculpts it and adds more contrast for a more low-key vibe. You can move between broad and short light by moving your model or your light to see what works.