I have a long jaw bone with a big chin and poor cheekbones.

 Hi, I have performed many facial shaping procedures using dermal fillers, silastic facial implants (cheek, chin), liposuction and/or facelifts for over 30 years.  Non smiling photos of your face from the front and side would help in the evaluation.  
 Following my beauty principles, women look the most feminine, youthful and attractive with heart shaped faces.  Heart shaped faces have cheeks that are full and round in the front.  Cheek augmentation with a dermal filler or using cheek implants for a permanent enhancement will create full, round cheeks that will feminize the entire face.  Conversely, men look chiseled and handsome with angularity in the cheeks, chin and mandibular angles.   In my experience when the face is elongated, cheek augmentation with cheek implants will properly shape the face.Hope this helps