Nice and sharp on the face. Wonder if you could go a little lighter to reveal a bit more detail on the neck. HA is not correct. Lighten the eye would help too.
Excellent low shooting angle, like the half submerged look.
The head would have looked better if it was turned a little bit more away from the camera, more in profile.
Great low angle - very effective perspectyive for this low swimmer. I personally like the HA as is (kinda like it is saying "aha, I know you are there!"). I would only like a tad more room added in front if you have it in your original file.