How do you get better at anything? Practice! Stand in front of the mirror and practice expression. The number one problem with headshot sessions is discomfort in being overly self-conscious. The common element to any great headshot is confidence. What overcomes insecurity is getting comfortable with yourself. So look yourself in the eye everyday. Practice a subtle closed mouth smile and an open mouth smile. A slight narrowing of the eyes from the cheeks up can add warmth and sincerity.