Hi
If you've removed the image in eBay, you'll need to add a new one in your eBay listing, this time specifying the new image's address that's in Auctiva - it's listed as "URL" in your list of images on Auctiva.
For future reference: If you have a live listing in eBay with an image hosted on Auctiva, the easiest way to change it is to use the Replace facility. Your eBay listing has a pointer to the image on Auctiva's server. By replacing the image, you overwrite the old image with the new. The pointer stays the same so the new image appears straight away in the listing.
Hover over the "Images" menu option and choose "Manage". Select the image by clicking the tickbox next to it. Click on the blue "Replace" button at the top of the list. An "Upload and Replace Images" option appears. Use the "Browse" button to select the new image and click on "Upload".
Hope this helps.
Geoff