Southern Girl
You'll have to go edit the listing in ebay and change all the links to the photo at auctiva to the desired file name.
If done correctly, you'll see the result in ebay revision editor using preview. Make sure you get the links in the description as well as the free photo link for header and gallary (if you have one).
The link names are unique and should be self evident in comparing what's on the listing with your image files.
Dan