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Nothing that doesn't require a login and sharing whitelist is going to be much more secure. I guess you could just keep an eye on the number of views and take it down manually?
If you host the image on Google Drive, you can share it only with specific logged-in Google accounts.
They can still screenshot it though, and I'm not sure how you'd embed it. Also, you need to know their Google account, instead of/as well as their office email.
I work on a few 'confidential' projects, for my employer, an architect. I would like to images of some of these on a portfolio website, purely for circulation to prospective employers, some of whom will be my employer's competition. Apparently wix sites can be made unlisted, so they don't appear in search engine results, but what other steps could I take to minimise the risk of them being circulated by those I send the site link to?