Restylane Silk for lips, 1 ml or 2 ml? Should I do the borders outline only? Or the middle of lip? (photos)

Thank you for your question. 
There are many great products for lip filler. Restylane silk is a great filler for lip lines but would consider Restylane or Juvederm to add lip volume.   Juvederm Volbella is the newest FDA approved filler for lip lines.  It does a great job at softening lip lines without the bulky or puffy appearance. It is best to begin with 1 ml. You have beautiful lips so that would be an excellent start for you. 
Please consult a local board certified facial plastic surgeon for more information and a comprehensive consultation 

Hi Jenn,
Your Luis are beautiful.   I would recommend doing just the outline of your lips.   Restylane Refyne can give you a similar look to that of Silk. But, Refyne will last longer.   Start with one ml and you can always add more in the future.  Watch my video below which explains outlining vs. volumizing filler techniques.   Good luck,  Dr. Onir