Long Thin Narrow Face? (photo)

A long, narrow face can be tapered with the appropriate use and placement of injectable volumizers. One approach, the Nonsurgical 3D Vectoring Facelift, which uses volumizing fillers, such as Radiesse or Radiesse combined with Juvederm Ultra Plus XC, can help to vector the lower face upwards and outwards to oppose the natural tendency for this region to move downward and inward with time. By so doing, the lower face assumes a more triangular appearance, tapering toward the chin and flaring somewhat toward the cheekbone areas.

If still needed, the cheekbones may be further nonsurgically enhanced using the same combination of volumizing materials(in the U.S.), which is what I do in my Upper East Side NYC practice, or can be even better enhanced with more robust and longer-lasting volumizers, such as Restylane SubQ, Juvederm Voluma or Stylage XXL (in my Israeli practice where the latter materials are regulatory agency-approved). The result a more tapered lower face and whose overall length is additionally broken up by an appealing outward flare of the cheeks. 

Pictures of you with your face at rest (not smiling) would be helpful.  Fillers would certainly be a potential option to help make a face more oval.  There are a variety of different fillers that could be used and the placement of any filler would be important to achieve a natural looking appearance.  A consultation with an experienced dermatologist, facial plastic surgeon, or plastic surgeon would be important so that you could be thoroughly evaluated and determine your options for treatment.  

Fillers and or Fat can be used to augment facial features. Which is a better option for you depends on many factors.  I would express your concerns during your consultation.  Your surgeon will be able to make recommendations which is the best approach. Cost and downtime may be limiting factors.

As we age our faces will begin to look longer, even if we had a more width when we were younger. Some are naturally long and thin-faced genetically. With weight loss this is accentuated. Traditional space-occupying fillers are an option, but it usually requires quite a bit of filler, and doesn't offer a longer-term benefit. Radiesse has some collagen stimulation capacity, but it's still primarily space-occupying. My preferred choice is Sculptra, which is not space-occupying, but is purely stimulatory--its stimulates the production of collagen, the main structural support protein of our soft tissues. Sculptra can be placed in such a way that the production of collagen and the resultant fuller look is very natural, doesn't "feel" like there's filler present, and will gradually allow you to morph into that more youthful and balanced face that you desire.

I agree that you need closer pictures with and without a smile but the existing picture validates your concerns - yuu can consider having facial fillers in the cheekbones and also along the jawline to give the more 'oval' shape you seek. Consult a provider who provides fillers like Juvederm, Radiesse or fat injections.