I want to do Dysport all over my face to make my chubby face narrow. Is it safe? (photo)

Dysport, like the other commercially available botulinum toxin products is a neuromodulator that works by weaking muscles.  Properly targeted, it is a great product with immense popularity.  Used improperly, all of the agents can produce very unpleasant side effects.  So while your goal of improving everything about your face is understandable, what you propose will not accomplish your goal.  I recommend finding a cosmetic surgeon/physician with excellent training and having a formal consultation to learn what services will make the most sense for you.  Look for a physician or surgeon in the core aesthetic specialities: Dermatology, Oculoplastic surgery, facial plastic surgery, and general plastic surgery.

Absolutely do not do this, and if you find someone who is willing to do it, run away. Neuromodulators are used to make muscles stop contracting. Putting it into your cheeks will mean that you cannot move your central face, which means you can't smile or move your mouth properly. You can have targeted areas of treatment, like your jawline, forehead, crow's feet, etc. But no, you should absolutely not try to use any neuromodulator on your full facial muscles, or I promise you won't be able to talk, smile, eat, or look normal at all. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."