Well, you've got a good concept, and great talent...but it looks too empty. There's no people, no gardens, airships, oxcarts, or kitchen smoke--all of the things that make the city look lived-in, you know? I don't mean to sound negative; I'm actually trying to be helpful.
I really like the use in different architecture types here. The domes, columns, stairs, and all the different geometric shapes coalescing into a work of art worthy of a book. I wish I had the skills to make such master pieces such as the ones I see on this site. Well done all .