Hair and makeup can really make or break your headshot session. Though they are very important, that doesn't always mean you have to have them professionally done to have a great session. For starters, Men almost never will need to use makeup for their headshot session. The only thing I would suggest focusing on is cutting down on the shine by using rice paper or a towel. Other than that, making sure you are well groomed and have neat hair is all you would need to focus on. For women, You really want to focus on presenting yourself as you would if you were going into an audition. Heavy makeup can usually be very distracting. We at Glass Darkly always support the most natural you so if you'd like to use makeup or not it's totally up to you. Hair can drastically change the look of your headshots as well so come prepared with a few different ideas for changes.