I've been practicing painting smiles. It's really tricky to paint a smile and have it look natural, so I've been doing quicks studies of the expression and variations thereof. The one below is really only a half smile. Also! I've finished (or just about finished, I want one more look in the morning to see if there's anything else I want to tweak) "The Sandcastle"... I'm already plotting the next Sebbie.
Half smile study: