Google Photos update adds option to bookmark favorite photos
Google Photos' new Favorite button
The last new feature recently introduced by developers is the option to mark photos as favorites by tapping the star-shaped icon that appears above every photo in Google Photos. Then, if you head to the Albums tab, you can view all your favorite photos in just one place.
Apparently, Google Photos users will soon be able to “love” the photos shared by their friends. A new heart-shaped icon will be available above photos, possibly next to the one that lets you favorite a photo, which will allow you to “love” a shared photo. No word on when exactly will be made available, but at least we know it's coming.
Things that are NOT allowed: