Photographs are interpretations of reality; as such, it is entirely subjective. Most photos are taken with an agenda, to sell something or to make a subject look better than it really is. Think of family snapshots - everyone is smiling and happy.
Martin ParrIf you photograph for a long time, you get to understand such things as body language. I often do not look at people I photograph, especially afterwards. Also when I want a photo, I become somewhat fearless, and this helps a lot. There will always be someone who objects to being photographed, and when this happens you move on.
Martin Parr