Interesting shot. I think it could be a little warmer, and some more contrast. I think the pose is a little awkward but otherwise cool shot. Nice work.
My comments or suggestions below are not a criticism of you, your model, your talent or skill. I offer them in a friendly tone of voice and with the sole intent to help you with a second POV and set of eyes. If you read sincere questions and simple suggestions as "criticism" of you, then you will miss how I am trying to help you.
Of course this may be your own "style" or your own "vision" and I suppose we can assume that the images look just like they do because that is exactly how you like them. That is OK too. It just shows that there are differences of "opinion" on what looks good. IF these are exactly what you want and like, then by all means continue making your images look like that and have fun doing it. As I always say: "Follow your own muse."
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Working in a pool sounds cool.
From my POV, when I look at any "pool" or "underwater" shots, I first look for how the image looks AS an underwater image.
Does the image made underwater ADD something I would not see in a studio shot?
So, looking at this posted image, does it look like being underwater added anything aside from a blue color caste?
From my POV, this particular pose, expression, and composition...and even the flowing hair and fabric could have been made inside a studio (a dry studio shot).
In other words, there is nothing distinctive about THIS particular image that makes one think "underwater" aside from the color cast and the tile ring behind her head.
My Simple Suggestion: use the characteristics of water to make an underwater portrait special in such a way that it could not have been made anywhere else (e.g. on dry land).
I hope these comments help and encourage or inspire you.
