As photographers it can be difficult to know when not to take a photograph. Sometimes these moments are out of our control, perhaps based on ethical, moral or religious grounds. When I look back at the times I chose not to take a photograph one moment stands apart from the others. It was early morning and I was on a train enroute to my job at a paparazzi photo agency. I had a window seat, which was unusual and I noticed her immediately. It was the billowing blue floral dress that caught my eye, it was so summery, so joyous and yet the weather was bleak, cold, dark and it…