As a performer, a lot of times you will get cast based on your look, age, vocal range and personality. They type of headshots you need will vary greatly based on these things and how other people see you. Are you younger looking? Do you have a deep voice and a moody look? Are you bubbly and smiley with a bright personality? Do you have that best friend look? Are you a character actor?
You can fill this out yourself, or even better, post this on you socail for your friends to get some outside perspective :) This will give you an idea of how to capture what you need for headshots.