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Thumbnails aren't on your thumbs. Not really. They're small drawings that help you test your ideas on paper for print, TV or for the web. You can use any medium to draw with, and it doesn't have to have photographic accuracy. Use a selection of these thumbnails to develop your other, more accurate layouts. Photographers find thumbnails to be extremely useful in setting up shots for client advertising.
Think of thumbnails as being a "visual brainstorming session" and get those creative juices moving!