Choose a subject in front of a background with depth. Select your shortest focal length and take a close low viewpoint, below your subject. Find a natural point of focus and take the shot. Not the ideal combination for a portrait shot!
Indeed this is not the best way to create a portrait. The buildings diagonals seem to converge behind the subject. Very dramatic shot, the subject seems to be alone and overwhelmed by the buildings. The other passing by, give a sense of isolation of the subject.