TIP 1 - PRACTICE MAKES PERFECT
Keep smiling in front of the mirror to see how you look. The more you do it, the more relaxed you'll be and you'll look more natural in pictures.
TIP 2 - SMILE LIKE YOU MEAN IT
There is nothing worse than a forced smile. Smile straight at the camera to ensure your smile reaches your eyes and looks genuine.
TIP 3 - DO A SMILE EXERCISE BEFORE THE SHOOT
Stretch your lips wide, then open up your mouth to a big "O". Wiggle your mouth around in different directions, then smack your lips together a few times. This will help relax your mouth and jaw.
TIP 4 - PREPARE YOUR PEARLY WHITES
When you smile, the first thing people notice are your teeth. So ensure you maintain your dental hygiene.