A successful stock photographer isn't afraid to edit his or her own work. Some experts even suggest being highly critical of one's work. Just collecting a huge number of interesting shots won't help you sell your photos as stock. For example, have you taken a landscape shot at a time of day that no one else has? Do you have a unique angle of a building or bird? If not, edit those photos out of your portfolio and keep trying. It's best to edit photos right after a shot when your intentions and goals for each shot are still fresh in your mind. Don't be afraid to edit your own work before you submit it.