When you delete a photo on iOS 8, it can still be retrieved from the phone for a short time.
Any image you delete goes to a special folder called ‘Recently Deleted; where you can retrieve it within 30 days.
Save the deleted image
Go to your iPhone's Camera Roll and click on the ‘Albums’ icon at the bottom-right of the screen. Next, click the ‘Albums’ option at the top-left of your display.
After clicking the ‘Albums’ option at the top-left of your display, the main ‘Albums’ menu display, showing your Camera Roll, videos, any favourites you've added and your Recently Deleted folder.
Inside the ‘Recently Deleted folder’, you'll see all of your deleted images from up to 30 days ago.
Click the specific image and tap ‘Recover’ at the bottom-right of your screen to restore an image back to your Camera Roll,
You can also recover multiple images from the ‘Recently Deleted’ folder view by clicking ‘Select’ at the top-right of your screen, tapping each image you want to save (a blue tick will appear on each one) and then choosing ‘Recover’ at the bottom-right.
You can also permanently delete images from the ‘Recently Deleted’ folder by selecting the image you want to delete and choose the delete option.