Lighting coming from the rear at an angle, or the sides of the dish however, can at times add texture and create a better contrast.
The Nikon Creative Lighting System (CLS) supports multiple photographic flash units seamlessly controlled by the camera via wireless. When used in tandem, the added lighting creates a perception of depth and more smooth-rounded tones to your subject, while balancing background/foreground exposure.
Some product examples include Nikon Speedlights SB-910 and SB-700, both fully compatible with the Nikon CLS.
Example: A Nikon D7000 with a Speedlight SB-910 attached at the hot shoe.