This is an actor posing as a statue in the Venetian Shops in Las Vegas. He/She is smiling because there were a couple of persistent tourists trying to tuck a bill into his/her hand so it would not be easy to dislodge so it would fall to the floor.
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Statues are hard to photograph. I think this could have been helped by trying to shoot at an angle that put more light on face, and then a tighter crop to really focus the viewer's eye.