Delete unwanted pictures right away
Unless you're quickly taking several pictures of the same scene, look at your picture as soon as you take it. You'll know right away if you need to take another. If you do, go ahead and delete the one you don't like. If you wait to review all your pictures and delete unwanted ones, your camera will probably insert new pictures into the spaces the deleted ones left. This can make it harder to sort and organize your pictures later.