The better pictures I have done usually consist of contrast or tension which, I think, gives more substance or interest to an image. It doesn't matter whether the contrast or tension is achieved by ways of colours, composition or a combination of such and other elements.
The longer one has been into photography, and with a bit of a practice, the more intuitive one becomes sensitive to the existence of such a scene. Here in today's shot, I was some five metres away from the subjects. At the very glimpse of the monk, the incompatible co-existence of a Caucasian face, using a high-tech smart phone, with a lay helper who is a female, at an haute couture shopping area was not among the images I managed to fumble from my mind. I lost no time in pointing the camera to them, paused a bit when going close and snapped the shot.