Is your head tilted in a certain way? Do you have a toothy grin or are your lips closed? Are your eyes focused on the camera or staring off in the distance? Is your face relaxed, with wrinkles around your eyes and mouth? Does your smile look natural or forced?[1] X Research source

Replicate your body position in the photos—tilt your head and angle your shoulders as they appear in the photograph. Recall the moment captured by the camera and note your emotions. Channel these memories and feelings; embody them with your smile.

Talk with the photographer so they get to know you better and figure out how to get a natural smile out of you. [4] X Expert Source Adam KealingProfessional Photographer Expert Interview. 7 April 2020.

Staring off into the distance can cause you to look bored and lifeless. [8] X Research source