In shot one, you can see a big, long, obvious blue thread hanging out of her blue tank top, and showing against her pink undershirt...details,details!!! Same with the bra poking out, and the back-fat protruding from the tank top's arm hole.
The third shot, ALMOST shows off her ample bust line and youthful figure...except that her shoulders are perfectly squared-up to the camera, which is a fantastic look for a linebacker or wrestler, but not the best for a young woman...
My guess is that you have many other shots, and these might not actually be "your best" shots. Many times it is difficult to self-edit.
I think shot #2 is instructive. I personally think THAT is a GREAT way to work with direct, unmodified, no-fill, high sunlight--throw the under-chin shadow down and onto the upper chest/lower neck area, and illuminate the front mask of the face fully, 100 percent, AS IF one were using a beauty dish or other "hard light". TO me, the lighting in shot #1 is a disaster, but the lighting in shot #2 is excellent. The pose in #2 is awkward, but your utilization of the natural light is good in shot #2!