When I smile, my whole face expands and looks really wide, along with my nose. What could fix these issues? (Photo)

You have a big large smile but minimal tooth display.I would suggest expanding the maxilla with a DNA Appliance to give a full wide smile that includes tooth display.Ira L Shapira DDS, D,AAPM, D,ABDSM, FICCMOThinkBetterLife.com

The best way to go on cases like yours is to do a Makeover, you will be able to change shape, size and even color of your teeth, thais will make a difference on the way you look and the way people see you, you can gain some milimeters on height, and also they will look nice and even, also you can change color, talking about stetics , this will help you a lot.