Everyone has a good side, Ernst says. "Take some time to look through old photos of yourself. Note ones where you really like how you look and figure out which side of your face is to the camera and how your body is angled."
For most people, a 45-degree angle (or 3/4 turn) is flattering, unless you have a larger nose, in which case you should face the camera straight on. "If you tilt your head away from the camera, make sure your eyes are still looking at it."