I think that the drawings exhibit good drawing skills. The cities depicted look rather utopian with the tall towers surrounded by trees and other natural features. There are no older 2-3 story brick commercial buildings, townhouses, or apartment blocks. Also not shown are side streets and parking lots. Several of the skyscrapers look like familiar NY landmarks.
__________________
My Detroit and Lego architecture photos: flickr/decojim/
I have listened to what you have said and are now around 1/4 of the way through drawing a city with streets, older buildings, houses, and smaller story buildings without the natural side of these...
Thank you Verticalextropy, of course this is now old work and so I can reveal my latest city, it is huge and more detailed so has taken months so far and yes months to go!