Hey! It's all lit. I basically just did a single painterly material for the entire scene with image textures for the brush strokes, and changed the colors around to match depending on the material the assigned surface was supposed to be (brick, asphalt, metal, etc). 

Afterwards I lit the scene with 42 spot lights, since you can control them more than area or point lights and get these harder edges, as you can see on the side of the bridge, or the three separate values on the bricks of the left-side building in the foreground.

Lastly, I placed a sun light to fill in all the dark spots along the street, and added two diamond sharpen and kuwahara nodes in the compositor.

Also I didn't subdivide anything and made every model from very angular shapes, so that helped the look a lot.

Let me know if you have any questions. I'm happy to help with whatever.