I love all the rich detail you can see in the rocks, but to me the triangle of sky made in the middle by the rocks is distracting. I'm sure not everyone would notice it as much as I do, though.
Agreed regarding details and colors - very well done! The right notch is effective in showing the sky (nice blues from the polarizer!) and it's an effective use of negative space - not too much either. Trying to determine if the blue triangle is truly distracting - I only started looking at it a bit more after reading Wallyb's post but it's dominated by the bridge's rock span a great deal.