Thanks for contributing to our forum. I just reviewed the issue you reported with respect to these items and, while I see you have since edited one of them to add "Click to Supersize" links, I ended up being able to determine that our system is not creating these "Click to Supersize" links automatically when externally hosted images are used.
I have forwarded the details of this issue over to our engineering team for further investigation and I will follow up with you through the support case you opened regarding this issue once I hear back from them and have some additional information to share.
While you are certainly welcome to continue creating these links manually through the eBay "Revise your Item" form, you could also potentially work around this problem in the mean time by using Auctiva hosted images in your listings instead.
I hope this helps. If you need any further assistance with your account, please feel free to contact our customer support team by mousing over the "Help" tab within your account and selecting the "File Support Case" option.