I am just like at a loss for words at the beauty of this piece of artwork!
First things first, the color choice in this painting is legendary (nearly as much so as the building.) The first thing you see about this picture when it appears is the oranges and deep yellows. They give an impression of sunlight dancing off of a thousand roofs. magnificent choice of contrast colors as well.
The amounts of detail you gave is perfect for the places you chose to put them. It shows the ornateness of the building, while still displaying its massive size and architectural solidity.
all in all, this is an amazing piece of artwork! Bravo and a perfect score from me.
I see that you have requested critique on this, but as I can only dream produce this kind of work for now, I for one can't spot any flaws at the moment. The perspective is lovely and I adore the colours you used. And I think I may be studying this closely (if I have your permission) to try and pick out how painting digitally should be done properly.