OP: Your image is underexposed, even with some of the highlights blown.
Idea: Go back and reshoot the scene with better lighting and exposure. Your shutter speed (in this condition) is still a bit long. This is the benefit of digital...... shoot, shoot, shoot. Get many exposures and pick the best of the lot.
this is why i post, cause if i didn't get feedback i never would have looked through my files and found this one..
i'm pretty sure this is the problem... i used a vari ND filter on the darker image, and when you use those if you turn it down alot it gives you a blue overcast to the image..and i'm betting i didnt set the white balance after i turned it down---it's a great filter but i think there is a learning curve to it..
anyway, here's another version that i think is alot better