Nice work. And good definition of scale. One thing is a bit off though. The structure is way too much into the corner of the canvas. Compositionally this is not so pleasant to view. A basic composition would be, if you'd divide the canvas with two horizontal and two vertical lines at equal distance. The points where these lines intersect are considered the idealistic choices to place the object you want to show. If you'd place the city on that point, this piece would look magnificent. Other than that, very nice work!