An important part of headshot photography is personality and having the ability to bring it into the shots. As either photographer or actor, you must be able to bring personality into headshots.
As an actor/headshot client, you need to know what your personality is. Are you a funny person? Are you serious? Are you nerdy? What kind of personality are you? If your best friend had one word to best describe you, what would it be? These are things to think about before your headshot season. Make sure you know so that when the photographer asks, you can be quick to answer.
It's vital to bring out your true personality in headshots because if you don't, none of the headshots will be true to you and real. The most important part of a headshot is that it represents you truthfully, meaning it shows your personality truthfully and your look truthfully.
There are plenty of ways to shoot so that someone looks totally different than they really are, and unfortunately, shooting headshots is much more difficult than clicking the shutter. A good headshot wont show a false personality or make someone look better than they normally do by showing them in special lighting or from a great angle.
You must have a headshot that represents who you are, and you must also act in projects that you fit into well. Its good to expand your range when possible, but engaging yourself in projects you are suited well for will result in an exceptional performance as well as more jobs in the future.
So make sure your headshot represents you truthfully, both in your personality and the way you look physically.