I chanced upon this Indian model with a lovely, strong jaw. Her face is the epitome of female beauty, and her defined jawline definitely contributes in no small part to her appeal.
The first image shows the well developed jaw in a 3/4th view. The second and fourth offer lovely side profile views. The fifth displays the nice strong teeth that accompany the square jaw.
If this doesn't make it to the main page, I don't know what will!