Thanks for posting your question here.
Our system will only resubmit details that have been changed during the relist process so, even though you enlarged the image on your Image Management page, the image was viewed as unchanged (since the URL was the same) and the was not resubmitted along with your relist attempt.
We may be able to update our system to recognize such changes and resubmit images that have been modified during the relisting process with a future update to our site, but I cannot be certain if or when we will be able to do so at this point.
I reviewed your account and it appears that you were already able to get this item relisted directly through eBay but, if you were to encounter this again, I believe you could work around this issue by relisting the item using the “Edit and Relist” option and uploading a new, enlarged copy of the image during the process or simply posting the item anew from your Saved Listings page.
If you need any further assistance with this, please feel free to contact our Customer Support team directly from under the “Help” tab on our site and we will be happy to continue working with you.