#8 is a good example of what not to do. Her shoulder literally fills the entire bottom edge of the frame because the camera is far,far,far too close to her, and the lens focal length is far too short. The closeness of the camera to her causes exaggerated foreground/background size relationships, causing her shoulder to look absolutely massive in size.
In a similar vein, take a look at shot #3...in that one her hand looks absolutely TINY, and her face looks HUGE...again, this is caused by being far too physically close to the subject...at close distances, the PHYSIUCAL, on-sensor, on-print, on-screen, etc size of the foreground is LARGE, while things in the background appear much,much SMALLER, by comparison, and also in an absolute, measurable sense. So, for example in shot #3, her hand width for four fingers is a measured 5 picas on my monitor; her head height from hairline to chin is 21 picas.
I just measured the width of my 4 fingers on my left hand: 22 picas, and the height of my face from hairline to chin is 51 picas. Simple math shows actual, real-world hand-to-head ratio of 1: 2.318, while in photo #3 her head looks HUGE, with a ratio of 1: 4.2. In other words, your ultra-close camera positioning is causing her head to look almost double in size, while in photo #8 her shoulder is physically, on-monitor, on-print, on-sensor, probably close to almost DOUBLE its actual size. These two photos make her look awful. Shooting a heavy-set person from straight-on and from very close range with a short focal length is absolutely the worst way to shoot. If I were her, I would be p*SSed that #8 is even being shown...
The best course of action is to realize that there is a "best distance" and a "best range" of focal lengths to use for portraiture, and all of these are using too short a lens length, and are shot from too close-up. I selected #3 and #8 because both show what is called "apparent perspective distortion." One of the single biggest problems that crop-sensor bodies have introduced is the need to use short focal length lenses in many indoor and outdoor situations, to compensate for the fact that the outside of the lens's image circle is not being captured...when you find yourself indoors, shooting a full-length portrait at 17mm on a 1.5x body, you will see that the noses of people look unnaturally large. The same issue has befallen you in this outdoor session...
This is the best and most-constructive criticism I can offer to beginning portrait shooters who shoot on crop-body cameras: back UP and ZOOM IN. If your sitter's head looks 4.2 times taller than the width of his or her hand, you are FAR TOO CLOSE. If the subject's closer shoulder looks (and also actually measures, on-screen!) 2x larger than it does in real-life, you need to back away, and zoom in.