Some may think I'm completely anal retentive, but I really hate it when folks are all "it's just colors". Drawings are "just lines", PA is "just pixels". As much thought and time can go into crafting a good palette as can go into making the piece itself, it's still an aspect of the image that the artist spent time and creativity on.
I agree with ND that the platforms have priority issues, maybe try adding some bright highlights, especially to the top surface.
The water texture looks much better, but you've got these three really distinct bands that could intermingle a little and look a bit more natural.