br.avery,
The following is not a rag, but CC as an aid to assist with your photography. Please do not take this as a slight on your photographic endeavors, it is not meant to be construed as such.
Are these for your "Fashion" portfolio, or "tear sheets" / "head shots" for prospective models? For fashion photography - it is about the clothes, and making someone interested in the design. Head shots - showing modeling agencies the prowess of that model. Both serve a completely different purpose, and need to be shot accordingly.
For fashion photography - as mentioned previously, they are all cropped too tightly, awkward limb loss, etc. Ex. - #1 knee cut off; #2 head, elbow and hand; #3 bottom of right hand... etc. Images are all shot at about the same distance to subject, level with subject's eyes, etc. (You need to vary it up a bit, and look at a lot of established fashion photographers work to see where they are going compositionally, lighting, etc.
For head shots - crop in closer, but vary it up as well. You can take a penny to your screen (but please don't) and cover every single models face with it. They are all the same size. Again, very your angles, pov, scale, lighting, lens choice, etc.
Over all, think about the rule of thirds. Ever play tic-tac-toe? Where the lines cross of the tic-tac-toe symbol is a good place to put the main focus of your subject - to start with. While rules are meant to be broken, they should only be broken once you understand them, and only when it adds to the photo. (Not just because you could.)
Finally, lighting... lighting... lighting. Oh, and white balance, too. (The last model was shot in indoor available light, which gives a nasty color throw to her hair, and skin. Proper lighting will assist with giving your images a dimensional look, specular highlights. (This will require off-axis lighting... do away with your on-camera flash, and invest is a couple of cheap radio poppers.) Depending on your budget, go Pocket Wizard. A good resource for off-camera lighting is David Hobby's Strobist blog.
HTH,
Art