Hi, I have performed many lip augmentations over the past 30 years using either dermal fillers or lip implants. From the photos, your lips are very thin with the upper lip about 25% as full as the lower lip. Following my beauty principles that I have developed over the past 3 decades, the upper lip should be approximately 75 % the size of the lower lip for the lips to appear balanced. The lips can be augmented using a dermal filler or a Permalip implant. If you choose a permalip implant for permanent enhancement there are limitations to what size (thickness) can be used as there's an issue of overwhelming the existing lip tissue that would result in extrusion of the implant. In other words, there is a finite amount of implant volume that can and should be placed in each lip. In my humble opinion, the 5 mm lip implant is associated with the highest % of unwanted side effects which in my mind is compounded when the lip(s) are very thin which would not provide sufficient tissue coverage for a thicker implant. I tend to use the 4mm implants which avoids those issues. I would suggest using a 4mm in both the upper and lower lips to provide the maximum, safest degree of lip augmentation that can be achieved using this type of lip implant. For additional lip volume, following Perma lip implant placement, your best course of action is to have the lips filled with an off the shelf dermal filler. Whatever volume is derived from the implants is a permanent enhancement which is the main benefit of having lip augmentation with implants versus dermal fillers. That however doesn't mean that there's an unlimited degree of augmentation, to the lips, that an implant can or should provide. I would like to mention that in my opinion, dermal fillers and lip implants offer a much more reliable volume for augmentation of the lips than permanent fillers or fat injections which are associated with increased, unwanted, side effects.Hope this helps.