Hi,
I would leave the color as is - blue gives a feeling of water and works well. I personally don't think you need to sharpen, since sharpening will not fix blurs of this nature. Instead, you may want to further accentuate the blur, since the picture is to do with flowing water - so even something like applying a gaussian blur (radius 2-3) in a new layer, setting mode to multiply and decreasing opacity in photoshop may make it more etheral (and somewhat of the artistic retouching category, though)
My only suggestion is to do something about the rock in the lower right corner - its big, bright and takes focus away from the water - cropping/burning may help.
Just my opinion, anyway 
regds
arjun