Looking good. Water seems to reflect the windows and kinda looks pixelized on account of that. As for the buildings, the one on the left with green window/lighting looks good and the flat top one just right of center looks very realistic. Rest seem to be a bit ambiant. I'd lower the height of the mounds in the foreground. Shadows could be a bit stronger, you might want to play with the sky a bit on that. Ok, that's enough of being critical. This is a great image.