At present, image uploading is a 2 stage process. The image is uploaded to the seller's gallery, for possible reuse, then it's selected for inclusion in an auction.

When uploading an image as part of creating an auction this is an irritation. It's needless effort, which other auction sites handle better.

Instead, include the image in the auction, no extra step required. Inclusion in the seller's gallery could either be automatic, or there could be a checkbox (ticked by default), to be unticked in the unlikely scenario where the seller doesn't want it in their gallery.