Hi Nicolas,
Very nice! You're getting better all the time, the practice pays off.
The blond model's face is very nicely modulated due to the almost classical lighting setup. Moving the main light a couple of inches higher would have given a good basic portrait lighting, and maybe a little less light on the arm. Her left arm draws a little too much attention for my taste, I'd 'burn' it a little darker in postprocessing. Also, in retrospect and while commenting from the sideline (which is much easier than actualy doing it), a slightly higher viewpoint would have reduced the size of her nostril openings. The background could have used a bit of a light spot behind her, or some gradient. It's not bad as it is (it makes her come forward), I'm just thinking about what might make it even better. All-in-all, one of your better images.
The image of the darker model has a nice diagonal composition to it, with her amazing eyes leading the viewer back into the image. Her skin looks a little blotchy on her right cheek and under her eyes, probably needs some more refined postprocessing to get closer to 'perfection'. The background has enough modulation to avoid being boring, yet little enough to avoid distraction. This is also one of your better images, as far as we've seen here on OPF.
Kudos, and keep up the good work.
Bart