Ok, the left one seems to have some details for now. Let's take care about the center and the left one. I'm using only that brush, we've started with.

Eizzium - interesting looking illustration



Eizzium - interesting looking illustration



Eizzium - interesting looking illustration



Eizzium - interesting looking illustration



Eizzium - interesting looking illustration


Shadows can be done with any king of brush with opacity or Flow set to 1% - 4 %.

Eizzium - interesting looking illustration



Eizzium - interesting looking illustration

I've painted all this on a separate layer so now I can move, transform and do whatever I want and it will affect only my building. So I will drag it a little bit to the bottom and pain a roof or something to my center tower.

Eizzium - interesting looking illustration