I do have a few screenshots of where this map could use some improvements. Going in the order of screenshot-> suggestion.
Parking Garage:
This structure could use some serious improvements in terms of detail, I suggest that you add maybe a few beams running along the ceiling of the garage. Also for the first floor ceiling, the fact that you can see the lane lines on the floor below doesn't exactly look good, try something more like this:
This way you can still have your lines, and not have it show up on the floor below.
Corn:
This could use the most improvement. First off, I recommend you remove the building in the cornucopia. If anything at least move it to an empty spot on the map with MCEdit, this building in my opinion is the best built building, but worst placed. The placement of this building could slow down the game/ be a death trap at refill if you are in the building, as there is no quick and painless escape from that building. It would be a huge obstruction for the corn design that I have in mind. I also suggest removing some of the trees next to the building, just to improve the efficiency of getting in and out of the cornucopia. The second and biggest improvement I recommend is doing something like this:
It will help improve the looks of the map, and it will add something original to a not original map, as someone has yet to make a cornucopia under a city bridge. The bridge would also add a sense of realism to the map, normally you wouldn't find a road like that in the real world, most likely there would be a bridge spanning the gap. Also I built this in a rush, so you wouldn't have the original road lines below. Also you would edit the cornucopia with maybe a few touch ups, I just built the bridge.
Twin towers:
This building seems to just ignore the law of gravity, and any other real world law. Where is the missing part of the walkway? Did it just disappear from midair? At least add some kind of rubble under the walkway on the road. Or even try and make it look like the two pieces of the walkway are beginning to fall over, and/or have already fallen over.
Those are the suggestions I can think of at the moment, I'll edit this post when I think of more.
