The composition looks great! I also like the texture of the water in the background
I would have chosen a different outfit, a bikini top that better suited the shape of the model's breasts since triangle bikinis usually work best on women of a smaller size. It doesn't look bad at all, however, it's something to take into consideration for the future, since you can take advantage better of bodies like that with the proper outfit.
The depth of field makes a nice cutout of the subject, I would've liked to place the horizon line a little lower but I understand that it might be a location limit, I've had my difficulties placing horizon lines on the beach.
It's overall a nice picture, the fill light is very well executed