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The photo you use in your contest provides a great opportunity to highlight a particular product or person. It is also a good place to show some love back to your followers. One great variation on this contest is to solicit photos from your followers in preparation for the contest. You could have a pre-contest contest to determine which photo you’re going to use.
To make sure you get photos you can actually use, it’s best to have some pretty strict parameters for eligible photos. You don’t want every one of your Twitter followers sending you photos of their cat sneezing. You want photos that reinforce your brand, your community, or your place as an expert in your niche.