You can choose what displays behind the shortcuts and widgets on your device's Home screens and lock screen.
1. From the Home screen, touch and hold an empty area of the screen.
2. Touch Wallpapers and select Home screen, Lock screen, or Home and lock screens.
3. View preloaded wallpapers by swiping to the left or right at the bottom of the screen. Touch a thumbnail to enlarge it. Touch Set wallpaper to apply the selected wallpaper.
• Gallery: Select a wallpaper from photos you have taken with your camera or uploaded to your device.
• Photos: Select a wallpaper from photos stored in Google™ Photos. Available only when Home screen is selected.
5 .Crop unwanted areas out of the photo and touch Done.
NOTE: Preloaded wallpaper cannot be deleted, but you can remove wallpapers you have downloaded. From the thumbnail scroll, touch and hold a thumbnail to select it, and then touch to delete the wallpaper.