I would prefer not to use my usual vector-like art style shown on the right.
Above is a concept I painted in a few hours, partially inspired by Sim Tower from the 90s. I made things pop with white outlines and air brush, like cutouts of paper shadowing on top. If I were to attempt all this in my vector style with full colors, or even some semi realistic style, then it would probably take days of arduous effort and still I would not be satisfied. Sure, this monochromatic blue style lacks contrast, but it gains contrast when compared side-by-side to the other games in the app stores that have super vibrant colors.