One of the best things about shooting digitally is being able to re-shoot a photo that didn’t come out quite as you planned. But instead of deleting those mistakes, just re-shoot it. Later, when you’re scrutinizing the photos, you might find a gem in those mistakes, or you might at least be able to carve a gem out of the rough by cropping, changing it into black and white or adjusting it in Photoshop. Just make sure that you must have plenty of spare memory cards with you  you can fill up a card much more quickly. NEVER delete an image – you might just make a mistake and in the heat of the moment delete the lot! That said you can get image recovery software – but why take the chance?