The head shot is much easier to deliver with a keyboard or on a flat range than in the real world. Much more importantly, the head is a very heavily protected target for most pistol ammunition. Unless it's the only target available, it's a really, really poor choice. I'm personally aware of 2 cases (1 at a range of less than 6 feet) where the bullet skidded around the skull under the scalp.

A much better target is the base of the throat.