You can start an auction in the auctions forum, and make sure that you have rights to sell the images if you purchased them from another player, have made a trade, etc. (Some players don't like having their art resold, that's why I mention this).
When you make your thread, post images with separate names or titles so they're easy to identify if you want to auction multiple at a time. Then, under each image, keep track of the following information for only the image:
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SB (starting bid): What price you want to start the auction by. This won't change when bids are made.
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CHB (current highest bid/bidder): Here you can put the highest bid at the moment, as well as an optional username to keep it neat.
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MI (minimum increase): this is a number that you set up so that bidders have a minimum to meet. Example: MI: 50, so bidders can only raise their next bid this many mush above the previous bid.
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AB (auto-buy): This is the ultimate price to pay if they want the whole piece. If someone makes this bid, they automatically get the art for the predetermined price. There is no exception to an auto-buy.
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Completely finished, you should have each image titled (best done with numbers) so that bidders can reference exact images in their bids, each image should have their own SB, CHB, MI & AB beneath them for utmost neatness. I hope this helps, and you're welcome to PM me or a fellow mod if you have further questions!
Summer Month: 3 
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