My chin goes downward on the right side when I smile. Want it fixed. (Photo)

Without the benefit of a 3-D cat scan, it does not appear to be a problem with the bone of your chin. On the side view there is some ptosis (drooping) of the soft tissue and some asymmetry. I would get a 3-D cat scan to make sure the bone is symmetrical, and if that is the case, various fillers and/or Botox can be used to improve the soft tissue (skin) asymmetry. It is possible a chin implant can help with the ptosis and asymmetry. Best of luck.

I would definitely want to do an in person examination prior to treatment recommendations. It could be many things causing this. Consult with board certified plastic surgeons to find someone you are comfortable with and proceed from there! Best Wishes!

first thing I'd do is try some botox or dysport there. There seems to be a bony asymmetry of the chin amplifying the muscle droop when you smile. Botox or dysport will make the droopy to not contract and it will also make it smaller. Easy. From there you could go to an open reduction of bone.