The horse is out of the barn, unfortunately. The recent victim's screenshots had the same photos as the first incident (HR showed them to me).

I no longer have any public photos available except on LinkedIn. I will consider taking that down.

You may be able to spoiler the photos by posting them to several stock photo sites and meme sites. Basically flood them so they are obviously random internet finds.

This does come with obvious downsides.

Which really isn't an option for a lot of people. Even leaving aside personal stuff, I probably have hundreds of photos associated with conference talks and the like.