Smiling is Infectious or A Ray of Sunshine?

I had a wonderful time over the summer taking photos of another local artist's granddaughter. Thank you to Sim Wong and her family for giving me permission. This is the first of several paintings I am planning to do of her. Sometimes the expression says it all and there wasn't much need for me to do anything else to convey the message so I kept the background very high key. Her smile is so infectious isn't it. I couldn't help but smile as I painted her.

It was painted on Winsor and Newton Cold press paper and I really enjoyed working on it. I haven't decided on the title yet. What do you think? 'A Ray of Sunshine' or 'Smiling is Infectious"?