In the middle of weary people rushing home at the close of day, I saw this happy lady walk through the market carrying a birthday cake. With head high and pep in her step, she was one of the few people in the market with a smile. Other faces were creased with emptiness, weariness, worry, or wonderment. Why was she so happy? Perhaps she was so focused on making someone else happy that she forgot herself.
Managua, Nicaragua
Steven's Travels and Thoughts 
It is definitely a look of happy anticipation! And that makes you forget yourself.