How do I get a wider mouth? (Photo)

You should consult with an orthodontist as well as cosmetic dentist to discuss your options. Orthodontics can widen your smile and veneers can make your teeth wider and longer. Your face is much narrower and you have thinner lips. 

Everyone is created different and you cannot be made to look like someone else. In your case, I would recommend an orthodontic consult to move your teeth into better position as there is crowding and overlap. Your teeth also have not fully erupted (genetic condition) and your smile can definitely be more proportional between teeth and gums. But your jaws are constructed differently then your ideal model and we can't duplicate it. Nevertheless, we can make you look YOUR best. Good luck :) 

The first step to a wider smile is a visit to the orthodontist. Braces will improve the alignment and can make your smile broader. After orthodontics you may also consider doing veneers. Veneers can add additional width. One thing to understand is that you have a much narrower face than Nicole does. Look at the shape of your lower jaw compared to hers. There will be limitations to your ability to make your smile exactly like hers, but there is room for improvement.