Getting the most out of Google Photos
You can view a photo in Google Photos, add a name to a face, and Google will automatically find all similar faces, even as the person ages. Neat. Sometimes it gets it wrong. View the face 'group' and select all the wrong faces, choose the three dots in the top right and choose 'Remove From Group'.
If you see a photo that's in the wrong group, you can take it out.
On your computer, go to photos.google.com/search. Click Next Next. Open the face group you want to remove something from. Click More and then Remove results. Select the photos or videos you want to remove from the group. At the top, click Remove. Note: If you remove an item from a group, it will not delete the photo or video from your Google Photos library.