You want your headshot to get you noticed. Chances are you aren’t trained in photo selection for the film industry. It’s easy to pick an image that you really like or that you think flatters you. But this image is not always the picture that will get you work or get you noticed. It’s best to have someone who works in the industry help you select your headshots.
Your agent, acting coach, and photographer are all great resources for this image selection. All three of them work with actors, headshots, and the industry every day. They know what will get you noticed, and more importantly, what will get you work. Take their advice.