Tom Selleck could have long hair, short hair, or no hair at all, and we'd still recognize him because of that iconic mustache. It's the single most defining thing about his appearance, and even know we're humming the theme song from 'Magnum P.I.' while we're looking at this picture.
This hairstyle was very much of its time when this picture was taken back in 1985, but we don't think it's his best look. Nor does he, based on that glum facial expression.