Consider these comments as coming from the peanut gallery of a hobby glamour photographer ...
You've done a good job focusing on the eyes. Also I like the lighting: gives the images a nice warm soft, feeling.
I like the realism of the model; she seems not an airbrushed perfect abstraction, but rather has a 'girl next door' look, for lack of a better phrase.
However the lime green background and the tilting up and down makes me seasick...
Another thread has commented about tilted horizons not working except for special effect in unusual cases. You've tried it, so you can now say you've been there and done that ...
Of the images posted I think the last is the best. The white bra contrasted with her skin, and the showing of more of her, indicates she has a good body and adds to the appeal of this image.
I wonder how that last image would look if you could photoshop it to transform lime green pixels into the same shade as the beige part of the background. Sorry that I can't tell you how to do it, but I bet it can be done and it might make the model "pop out" from a uniform bland background.
All of the photos have good qualities and your series inspires me to try close up glamour headshots, something that I've not really spent any time on. I'll try to attach one where I think I had some luck and good advice.
Be glad to trade ideas or comments in the future.