When searching online for tips on how to get the most out of an actor headshot session, mostly what I found was where the actor should go, who's the best, who's the most expensive, who's is the best for the least amount of money and the number one result was for the photographer on how to take the perfect headshot. But what about some information for the hundreds or thousands of new actor talent, and hopefuls that knock on the grand doors of Hollywood every year looking to make their mark in the fabled city. 
    Many young actors do their best to prepare by asking fellow actors from their acting classes, researching tirelessly to find a talented photographer, and  others are lucky enough to just have a look or be that shining talent that casting directors just can't say no to. However, for those just starting out, these next few points may help during the process of achieving a great headshot.

1. When you are finally in front of the camera, don't let nerves take over, and remember this is not like any other image you have taken before. Go into your character, this image needs to show personality. The best way to achieve this is to think about the character you would like to portray. Once you have it in your mind it will translate to your expressions.
2. Do your homework, make sure the photographer takes headshots of people like you, and that he does them very well. Also look for personality in the images.
3. Meet or call the photographer before the shoot to make sure, you and she or he has a good working chemistry. You can tell if a photographer is passionate about their work in five minutes, if you don't feel their passion or their quality of work is lacking, find someone else.
4. When posing one goal is to show a strong straight jaw and neck line. The photographer should be able to assist with this, but you can practice at home in the mirror by posing with your chin down and leaning slightly forward toward the mirror, also play with the angles of your face. With a little practice you can make your headshot shine.
5. Lastly, this one may sound silly, but trust me it is the most important. Be prepared, put as much effort into getting your headshot right as possible, because it is your calling card and the right actor headshot can take you from the idea of being an actor to actually being a great or actively work actor.