Most people worry about the way their face looks during a session, but hair plays a very important part in defining your style. Some of the people who walk in into the studio struggle to convey a strong presence because they are self conscious about their hair. Never go to your session unprepared. If your hair ends are split and your hair looks frizzy, there is nothing a retoucher can do except replace your entire hair. Think that a Headshot is an investment that you do every 1-3 years, take it seriously, and don't be anxious to run into a session because you feel pressure from your agent, your manager or yourself. Take a step back and look at your hair: where it is, and whether you would like to stay with that style for a while. My personal take on hair, is that I much prefer healthy looking hair than interesting looking hair. As an actor, our image must portray strength, confidence and resilience, and I see that healthy hair always reinforces these.
What if you have no hair, or it is receding... again... keep it healthy. Don't attempt to style it so that it gains a lot of volume, or it covers areas that are less hairy. You may try to do that before you enter the audition room, but the truth is that the casting director notices it right away and moves on because he is infinitely more interested in your acting. If anything, coming to terms with it will present a personal challenge to you and acceptance will only lead to your growth as an artist.
If you plan your headshot session carefully and you know how to take care of your hair, your will look confident, healthy and empowered in front of the camera. If you need help with your hair, don't hesitate to look for a professional that can give you some great tips on keeping healthy hair.