Emphasize Subject's Outline
Remote flash allows you to use the Speedlight off the camera and illuminate your subject from any direction. A remote flash unit requires no cables so it's easy to experiment with different lighting and it brings a whole new element to the enjoyment of photography.
One remote flash unit illuminates the subject from behind to show the texture of the dress and emphasize the face.
If your Nikon digital SLR camera has a commander mode, you can enjoy the remote flash technique by simply adding one Speedlight to your system.