Please understand, humans are complex. Body language is not a definitive tool to use to judge someone. It will give you an idea on a subjects next move. When street shooting, It’s easier to gage body movement, which can make a difference when photographing. Understanding body language and observational learning can build your emotional intelligence and social skills. Observing people takes a great deal of patience, incorporating body language with street photography will help you increase sharpness, heightened your senses and better your instincts.