It looks like you manually submitted your listing (shown at the link below) to us. In this case you can replace the image by selecting the 'Update details' link that appears for the listing. You can then upload a new image directly from your computer or supply us with an image url.
If however, you don't want to replace the photo but simply want to remove the current image, there's no way for you to so at this time, however we can do so on the backend.
Please post a reply here or click on my photo to contact me and let me know if you'd like us to remove the image.
Customer Service Representative