Smile, laugh and grin after rhinoplasty
These are all safe to do. The bigger risk is bumping into an object, a child or a pet. Also, avoid biting into a burger or apple as it can touch the nasal tip and hurt it.
Rhinoplasty and facial animation
It is doubtful if facial expressions made during the early post-op period would have any effect on the long term results of the rhinoplasty.