maybe try drawing pixel art from photo references.
Viewing post in Time Rescue: Game with Story Telling[Devlog] Rate my game!
Yes it has several layers. I started by drawing the background, then proceed to the foreground. The building should have a little bit more darker color than the layer before so it can give some kind of parallax effect. And as you can see, I also made it so that the farther a building, the smaller it gets.