I like the composition and am still deciding about the toning--something makes me wish there was a tad more contrast, but the tones you chose makes it seem more timeless, and that's probably good. :-)
Nicely done. I prefer greater contrast in shadows to balance shots like this. The vastness of the background puts all the pressure on the upper structure itself to carry the image. I'm not quite there with you, but know well that others will find the balance outstanding.