Pardon the alliteration, sometimes I can't resist! But there's an important point behind my silly sense of humor. The more details you have worked out in advance, the better your images will be, especially when photographing people. It starts with "seeing" your image in advance and experimenting with the angles and composition even before your subjects are in front of the camera. Once you have your shot set, nail down your exposure and, if possible, do some test shots with stand-in subjects. By being properly prepared, you can concentrate on directing your subject and shoot quick variations without wasting valuable time.