I really like this set. Your model is great. I love the way you processed these. Nice skin rendition. My only comments will be basically on positioning the face. This is all based on what I have learned in the past few weeks in my studio and location lighting class.
There are basically 3 ways of seeing the face. From what i am told, you really don't want to go in between these ways.
This is directly from my worksheet in Eric Breitenbach's class.
"Full face: straight into the lens of the camera.
2/3: that angle of the face at which both eyes are visible from the camera position, with the eye on the far side going almost to the edge of the face's outline. A small amount of flesh separates the eye from the background. The tip of the nose is contained well within the cheek. It does not come close to the edge, nor does it cross over the outline of the face into the background. The bridge of the nose does not cover the far eye.
Profile: Exactly one half of the face, straight down the middle. The eye and eyebrow of the far side are not seen by the lens.
In even, flat light, analyze your subject's face from the three angles above. Look at the 2/3 and profile views from both sides. You're looking for how the various angles change and display the shape and features of the face. A 2/3 view usually slims the face; a round face seems more oval. Square jaws are softened. Protruding ears are flattened/hidden. A profile will emphasize the entire shape of the face/head/ Hair will also make a difference. Look to see which side of the face shows the hair most engagingly. "
Now to look at your pictures and analyze the face.
No:
1. Very nice use of the Full face. Good job.
2. You are in between a profile and a 2/3 view of the face. Look at how the nose crosses of the edge of the face. it makes a weird outline.
3. This is a little better, it is closer to 2/3. The nose is still bordering/protruding the edge of the face.
4. This one is even better. Th nose and mouth are within the edges of the face. The eye socket however is a little to far to the edge. It makes the eyeball protrude the edge. It also exaggerates the eyebrow a lot.
5. This is a pretty good 2/3 view of the face. you can see how much more flattering it is on the face. It is a little close to a full face view, but it works well.
6. There is no six.
7. Ladies and gentlemen we have a winner. Perfect 2/3 view of the face. Perfect! Do that will the others. I like the pose too. I wouldn't mind seeing this one with her eyes engaging with the camera. Nice work.
8. This is another one the is between profile and 2/3. The nose crosses the edge of the face and is exaggerated.
9. This is a 2/3 view. The arm she is resting on squashes the face a little and makes it look a little unusual.
Keep in mind you camera angle in relationship to the face. The lens axis should be parallel to the vertical axis of the face. This will ensure correct looking proportions. For example: No. 9 If you were to shoot from a little lower of an angle, it would be parallel with the face and wouldn't exaggerate the nose quite so much. Try these things out and see what you come up with. If you are conscious of these things, it will make a dramatic difference in your portraits. It has greatly improved mine in just a few days time.
I hope I am not being too critical of your work. I personally think it is excellent work, and I love your style. In fact, I am curious to know how you post processes to get those skin tones. Anyway, nice work!