Your face doesn't look too gaunt or thin. For those issues, filler or dat transfer is best. If you are thinking about augmenting your lower facial structure, I can see how that could benefit. A chin implant is a great option. For the angle of the jaw, implants, in my opinion have a lot of issues, most notably asymmetry is a big concern. For that reason, and a few others, I prefer filler for increasing angle definition.
I would not say that you have a gaunt appearance, but there is some loss of volume in your cheeks that could be improved with either fillers or implants. There are a variety of implants and fillers that could be used. I would recommend consulting with a facial plastic surgeon or plastic surgeon to discuss your options.