I don't mind seeing other people's recent photos - but I do mind them seeing mine. How can I make sure my recent photos are not showing up on other people's people widget?
I'm pretty sure it displays content about you that's already in their email account because you sent it to them. In other words, if you sent them a photo, it's safe to assume you don't mind that photo showing up in their people widget.
According to Gmail support:
Thumbnails of recent photos your contacts sent you
Says to me that the photos you'd see are the same you'd see if you visited the person's Google+ profile. There won't be any photos exposed to a person that you're not already letting them see.