I have to agree about the facial expressions. You might even want to read Mr Gomez's book for his comments about expressions (do I get bonus points for referencing the book?

).
In the second shot you have reflections off the water on her abdomen - looks fairly unattractive. You could have avoided this by having her lean back a little instead of forward.
In the first two shots, at least on my monitor, it looks like you have blown the highlights on the left cup of the bikini top - the colour looks flat.
The first two shots do show, however, excellent control of depth of field.
(sadly, I have nothing appropriate to post, so I must defy rule 10)