You could try some of the other Environment mods out there.
Manos Environment Pro (M.E.P.) tweaks some sky/water coloring and ambiance. OLC's GUI comes with an optional environment of its own. I think RIK007 SH5 Water also changes some colors. There are more, but I can't remember off the top of my head.
They're applied over GWX and can be easily removed, so you don't have to worry about messing up the installation.
It's worth a shot. If all else fails, you could raise the gamma settings through Windows or your graphics card driver.
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