To sell event photography online, you need to enlist a photo proofing service, where clients can view and purchase your photos after proofing online; this can increase sales over traditional photo proofing methods (in person, with proof books), and reduce the cost of printing proofs.
Sell Art & Nature Photography
If you are focused on selling art, nature, and general still photography, a good place is iStockPhoto. This is a great website to post photography for single purchases of your proofs by businesses, magazines, and individuals who admire your work. Be sure to put your best foot forward, iStockPhoto has a stringent review process for your photos to get accepted. So, an online photo proofing website where you dictate what your customers see might be a better route if you want to sell photography online at your will.