You are right Ryuurui
Its best to take photos when the person is unaware. Get the most natural expression etc.
I'm not sure if its okay to take photos of people in the street without their permission.
when I see many gorgeous students in Brighton-- I would love to snap some of them. maybe with modern mobile phones there are lots taken without awareness I think.
I love portraits of people young and old.
Old lady drawing a temple's emblem, Kyoto