What I like about the "voyerism" style of photos is that the photographer isn't influencing the person being photographed. You're catching the person as they really are, they're not posing for you. People get self conscious when you point a camera right at them, whether they know you or not.
This one, I wasn't sitting 5 feet away from this woman, on the steps on a river bank in Singapore. I had the camera set up on a tripod and I used live view to set up the composition and focus (I was using a 40 yr old 180mm Nikon on my 5D3), but I made as if I was just tinkering with the camera, never getting into a position behind the camera where a normal photographer would be taking a picture.