"Armchair" diagnosis and cosmetic dentistry treatment plan.
Diagnosis: It seems that most of this person's cosmetic disharmony stems from a misalignment of their upper front teeth.
Cosmetic dentistry treatment plan step #1: Utilize orthodontic treatment to realign the center four upper teeth (possibly by way of using a removable orthodontic appliance rather than braces).
Cosmetic dentistry treatment plan step #2: If no spaces remain after the orthodontic work, reshape (trim) the four center teeth so their contours are more even and symmetrical.
Cosmetic dentistry treatment plan step #3: If spaces do remain after straightening the center four teeth, use dental bonding (tooth bonding) to achieve the final shape of the teeth shown in our "after" picture.