for iOS 9.1 software

automatically add it to the Favorites album. A photo or video can be part
of another album as well as Favorites.
Hide photos you want to keep but not show. Touch and hold a photo,
then choose Hide. The photo is moved to the Hidden album. Touch and
hold a hidden photo to Unhide it.
Remove a photo or video from an album. Tap the photo or video, tap
, then tap Delete Photo. The photo or video is removed from the album
and from the Photos tab.
Delete a photo or video from Photos. Tap the Photos tab, tap the photo
or video, tap , then tap Delete Photo or Delete Video. Deleted photos
and videos are kept in the Recently Deleted album on iPhone, with a
badge showing the remaining days until the item is permanently
removed from iPhone. To delete the photo or video permanently before
the days expire, tap the item, tap Delete, then tap Delete Photo or Delete
Video. If you use iCloud Photo Library, deleted photos and videos are
permanently removed from all your devices using iCloud Photo Library
with the same Apple ID.
Recover a deleted photo or video. In the Recently Deleted album, tap
the photo or video, tap Recover, then tap Recover Photo or Recover
Video to move the item to the Camera Roll or, if you use iCloud Photo
Library, the All Photos album.
iCloud Photo Library