Help with coloring

[DontKnow]

I have created a building inspired by one in my city, but I have had difficulty with the coloring and I am here to ask for advice on how to improve the coloring of

[FVI]

Try making it darker and less saturated. You might want to aim for a dark grey-ish blue

[DontKnow]

How about now? I still don't know how to do the floor and ceiling of the largest building.

[FVI]

That is much better! If you add some depth and details (air vents, pipes) on the roof of the skyscraper on the left it will be very good!