Loads of photos 📸 over on Google Photos. Head over to https://photos.google.com and look at what has been shared with you.
Not sure how to do that?
Open https://photos.google.com in a 🖥 web browser, click on the menu bar icon top-left to reveal the menu and just head to Sharing. Anything shared with you will be in here.
If you're using Google Photos on 📱 mobile, then the Sharing button is the one on the far right at the bottom.