I think the best photos are the one's people don't know you are taking , to capture a natural emotion is one of the best images you can capture . Also I find if the person you are taking the picture of knows you and they trust you it helps , you can see it in the way they look at the camera . Most the pictures I take are posed for , the best ones that I have produced are the instances where they have not been aware of it , and those I can count on one hand