If you happen to photograph a woman who has a long hair, you should be more vigilant. If you neglect the hair and focus on the facial features and other body parts only, the outcome may not be as satisfactory as you expect.
The best trick you can try when capturing a portrait of a long-haired woman is to leave her hair to one side. Such approach will make it easier for you to focus. The hair of the subject should be placed at the opposite side of the key light source. For instance, if the key light is placed towards her left side, the hair should be on the left side and vise versa. Otherwise, parts of her hair can leave unnecessary shadows on her face.