Developed as a Renaissance era painting technique chiaroscuro uses vivid contrast to give portraits a sense of depth. It works for photos too:
chiaroscuro flickr photo by Georgie Pauwels shared under a Creative Commons (BY-ND) license
Look for a way to take someone’s photo that uses this technique. Bright light from a window or an outdoor scene that casts strong shadows can help. It need not be just a black and white photo. See some flickr photos for inspiration.
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