First of all can you find out who has hands on her chast? If you can find out, write in comment please. Anyway, she does not look very happy, isn’t it? Someone is keeping their hand on her chast. If the photo is checked carefully, the guy next to her is holding her and another girl together and probably trying to take picture. The girl might have thought someone from behind her trying to do so and making face or is she just talking to someone not bothering who is keeping hand on her chast. Maybe there is some festival going on near beach area as people happen to have gathered here.