http://xs101.xs.to/xs101/06225/sfaa.jpg
http://xs101.xs.to/xs101/06225/Newmark.jpg
http://img274.imageshack.us/img274/2937/small4ra.jpg
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I really like your use of color on the first two, but I can't say the same about the third one. The water on the first one looks great. I don't know about the third one, perhaps it gets too busy toward the center of the render. I think it's the contrast in the water's color that takes away from it's realism (assuming that's what you were aiming for).
I'd say the second one is the best, followed closely by the first.
i would agree with last post ^^^^^^^^^^^^^^^^^^^^^^^^^^ the second one is really the best one, the third is just a mess around experiment to me.
i actually prefer the colours in the 3rd one, more pf a psychadelic feel than the other two. good job :D