Looks like the image is tilted to the left a bit and the sky shows compression artifacts. Trees are a bit blurry. If those were not present, I'd rate this picture much higher.
You might get dinged for the noise in this photo, I am assuming you are shooting with a smaller megapixel cam so something like Neat Image might help you... but your composition is very very good, and you chose a great time of day to shoot the monument.