I'd say at least 1cc/syringe would be best, although there is nothing wrong with starting with 0.5ml/cc and see if you can get away with it.
I don't see vertical lip lines on this photo but generally I start with 1 mL syringe of Restylane Silk when treating vertical lip lines (i.e. smokers' lines) and lips. Microneedling is also a good treatment for these perioral lines.