How to improve my lower third? (Photo)

Without an exam your question cannot be answered.  You will need to see an Oral/Maxillofacial surgeon to see if othognathic surgery, genioplasty or using an implant is best for your specific case. It should be noted that patients with severely weak jaws or abnormally functioning jaws may be better treated with other facial surgery (orthognathic surgery), although a chin augmentation may be an option at a later time. These patients should seek the advice of a plastic surgeon to determine which course is right for them. Here is some information to help you make this decision: Candidates for Chin Augmentation - Patients whose chin profiles are weak but have normally functioning jaws are candidates for Chin Augmentation. Many of these candidates have used injectable fillers in the past to strengthen the protrusion of their chins, but are looking for a permanent solution. If you are one of these patients, then you are a likely candidate for chin augmentation
#weakchin #chinimplant

You have provided only one facial view which shows a long vertical chin that has a narrow jawline behind it. Widening your jawline can only be effectively done using implants. Whether that should be just jaw angle implants or combined with some form of a chin implant can not be determined just by looking at the one picture you have submitted.

Thanks for posting the question. It is really hard from a single view to give concrete advice. In general, you are thinking clearly about the best options and either fillers or a silicone implant are your best choices.  I would encourage you to repost the question with more photos. Best of luck!

Your frontal contours indicate that you 'need' jawline augmentation to establish a well defined appearance and facial contour. The procedure is done intraorally and can extend from the chin to the angles of the jaw so that a blended and balanced result occurs. very cosmetic and straightforward

 Hi, I have performed many facial shaping procedures using dermal fillers, silastic facial implants (cheek and lip implants, chin), liposuction and/or facelifts for over 30 years.  Following my beauty principles, men look chiseled and handsome with angularity in the cheeks, chin and mandibular angles.  From the photos, your cheeks are already angular as you mentioned.  From the front view, I suspect that the chin is weak ( side view would help to confirm ) based upon the lack of a mental groove below the lower lip.  The following procedures would create angularity and balance in the lower third of the face and a more ruggedly handsome face.Chin augmentation, using a chin implant, to add projection to the chin creating harmony and balance to the lower face.  I have performed many facial shaping procedures, including Chin Augmentation with dermal fillers or silastic chin implants, for over 30 years.  When the chin is weak, this creates an imbalance making the nose appear larger, the mid face top heavy, the lower face looks short, de-emphasizes the lips and allows early formation of a "double chin".  Proper placement of a silastic chin implant adds forward projection to the chin thereby creating harmony and balance to the lower face.  Using the same incision, liposuction can be performed to reduce the fat and further shape the neck.  Excess skin, from below the chin, can also be removed through the same incision.  I have found that placement of a silastic chin implant, through a small curved incision under the chin (also allows excess skin removal) to be very safe, quick, highly effective and far less invasive than a sliding genioplasty (requires extensive tissue dissection, bone cuts and placement of metal screws and plates to secure the cut bone segments).  I perform chin implant surgery in 30 minutes or less, often using a local anesthetic alone.  In my opinion, you are a good candidate for chin implant surgery.  I do use dermal filler to augment the chin but a silastic chin implant proves to be far more "cost effective" over the years.  
Augmentation of the mandibular angles using a dermal filler (jaw implants have too many unwanted side effects IMHO) to add volume, angularity and flare to the jaw line.
Hope this helps.