"Engage the photographer in a conversation about some topic you both may find of interest," says Los Angeles-based head-shot photographer Michael Calas. If your mind is focused on something other than the photo, you'll appear less rigid. You can also lean against something, interact with a pet or a child, or intertwine your arms with someone else's. Also, never keep your hands right by your sides, says Chuck DeLaney, dean of students at the New York Institute of Photography, in New York City. Clasp them in the front or in the back, or hold on to a glass or your eyeglasses to help relax your body.