What filler is best for a chiseled sharp jawline? (Photo)

Hi Daisy, for a more defined, chiseled jawline and to strengthen your profile (and help prevent the dreaded jawline "jowl" sagging), we use injectable fillers like Revanesse Versa and/or Radiesse. Using a cannula to limit pain and swelling, we inject on the bone in strategic points to get more lift and shaping, resulting in a more contoured lower face and defined, structured jawline. I would suggest getting a formal evaluation with a facial sculpting expert. Best, Dr. Emer

I like using Radiesse along the jawline because it is a relatively firm filler, so it can provide good definition and create a sharper appearance.  

It would need a consultation or at least a photo to say for sure; however I would say a combintation of jawline sculting with lipo (dry lipo even if you don't have much fat which would to allow the skin to scar down) and fillers would give you the absolute best results. Hope that helps. 

There are other excellent answers discussing the choice of fillers for defining the jawline.  Keep in mind that although Radiesse is an excellent filler for that purpose, since it is not hyaluronic acid-based, there is no quick and easy reversal agent if you do not like your result.
To add some color to the answer, neuromodulators (e.g. Botox, Dysport) may also play a role in defining the jawline either instead or or in addition to fillers.  Although it's impossible to know in your case without photographs or an in-person evaluation, Botox injections into the platysma muscle (which forms the bands in the neck and extends onto the jawline and face) can often improve the appearance of the neck and sharpen the transition between the jaw and neck.  Botox is easy, relatively less expensive, and a short-term (3-5 months) chance to see if it would help give you the results you desire.  
Best of luck!