I really like the sense of tranquility. The colors are a bit flat; I'm not sure they could be brought out more without making the picture too overdone to work, though, given the light that was present.
Dull grey skies or very bright skies always present a challenge. If you want the sky to be exposed right then the shadows are too dark. If you expose for the shadows then the sky is blown out. In this situation it appears that the dark areas in your image are about a 1/2 to 1 stop under exposed. A different perspective that includes less of the sky may have helped this situation. 5
Interesting and very beautiful subject matter, but I find the image suffers from being too dark. Would like to have seen better exposure to help bring out the texture and colors of the structure. Also think you could have zoomed in a bit more to make your subject more dominant in the image.