What is allowed -
Photo is free to use.
Attribution is not required. But always appreciated.
You can modify the photos. Be creative and edit the photos as you like.
What is not allowed -
Identifiable people may not appear in a bad light or in a way that is offensive.
Don't sell unaltered copies of a photo, e.g. don't sell it as a stock photo, poster, print or on a physical product without adding any value.
Don't imply endorsement of your product by people or brands on the image.
Don't redistribute or sell the photos on other stock photo or wallpaper platforms.