1.   Its mouth curled upwards for the first time.

2.   Hard eyes raked Virginia up and down, and the coral-pink mouth curled in bored amusement.

3.   His mouth curled down into that famous smirky look.

4.   She looked at him and her mouth curled up.

5.   When he speaks, his eyes grow wide and owlish, his mouth curls into a circle, and he clasps and unclasps his hands like a priest.