How much would doing surgical facial conturing (zygoma reduction, mandible reduction & genioplasty, maybe masseter reduction) & rhinoplasty (for facial harmony post-conturing) cost in Singapore?

Congratulations on your rhinoplasty and I am glad that you are happy with the results. Before you proceed with the HA nose fillers, you should check back in with your rhinoplasty surgeon to see if he has any other solutions for you. Fortunately, one of the advantages of a total autologous rhinoplasty, of which I am a strong advocate of, is that in comparison with an implant rhinoplasty, the nasal dorsum is made of your own tissue. Hence, there is a lower risk of the HA filler injection causing an infection if done properly, and no risk of rejection of the nasal implant or capsular contracture.

Such scars are notoriously difficult to erase. Fractional carbon dioxide laser & micro needling may help improve the skin texture somewhat but the scars are likely to be still quite visible even after several treatment sessions. Patients often ask me if surgical skin grafting is possible but this option replaces the linear scars with a much more obvious skin graft and is thus not recommended at all in my opinion.