After taking a picture, assign it as a picture ID for a Contacts entry or as your wallpaper (the background for your Home screen or Lock screen).
From the Home screen, tap the Apps icon > the Apps tab (if necessary) > Gallery
.
Tap an image to view it.
With the picture displayed, tap the Menu icon (at the upper-right
corner of the screen) > Set image as.
Select an option.
Contact photo to assign the picture to a Contact entry as a picture ID. Tap an entry from Contacts, crop the image, then tap OK.
Home screen wallpaper to set the image as the wallpaper for your Home screen. Crop the image, then tap OK.
Lock screen wallpaper to assign the picture as a background image, crop the image, then tap OK.
Wallpaper to assign the picture as a background image, crop the image, then tap SET WALLPAPER (at the upper-left corner of the screen) to assign the picture.