Good job capturing all the detail in the shadowed underside along with the sky slicing through the apertures. In the distance, I love the contrast between the warm sunset colors on the right and deep blue sky on the left. Those reds in the middle are just what's needed to contrast with all the blue.
A truly excellent image.
This image is formally excellent with all the diagonals and lighting...it just has everything. I'd guess it was two exposures, but I could see it being possible with a long exposure at dusk. Any earlier and I would expect the sky to blow out. I also love the texture of the water!