Your smile signals approachability, happiness and confidence. Professional models have trick to get themselves "in the mood" and smile.

One method is to put your face about ten inches in front of a mirror. Look at yourself directly in the eye and say the word "great" in as many different ways as you can. Happy, angry, excited, loud, soft, high pitched, low pitched, like Michael Jackson or Mike Tyson, or whatever celebrity voice that tickles your funny bone.

Keep going. Eventually you will crack up. Repeat the exercise once a day for three days and the next time you meet someone say "great" under your breath a few times and you will be smiling!