wish your thin lips were fuller? Do what the models do: Fake it! How? Dab a small amount of lip gloss or (pearlized eye shadow works well too) in the center of your bottom lip. Your pout will appear fuller and, well, poutier.
If that doesn't give you the fullness you were hoping for, you can also dab a light eye shadow or highlighting cream just above your upper lip, smack dab in the center. Gently blend it in. Now, isn't that better?