What would I have to do for this and how much does it cost? (Photos)

. I want to change the way my chin looks and have a structural face. Way more definition. EVERYTIME I smile my whole face clenches up and looks really awkward. I was wondering what I could to to make my smile maybe more wide ? Because of how awkward and small my mouth is, also with lips that don't have a ridiculous caving Cupid's bow. More straight and less scrunchy in the face is my goal. Also a more defined nose. Please tell me what I would need to do for that? Thank you so much for your time.

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