Your pictures cannot be used by anyone else unless you give them permission. Having said that nothing will happen unless you ask the person to remove your pictures or report to ebay.

I had someone use my pictures for an item I sold about 2 months ealier, trying to report it was impossible as the 'report listing for copyright of pictures' only accepted a current active listing of mine that had the same picture. But I sold the item 2 months earlier so no current listing of mine had the pictures. In the end I had to ring ebay and they looked up my listing from 2 months prior.