In order to color complex street drawings with markers, you will need the following: markers in assorted colors and a street sketch. You should begin by coloring one building at a time. Choose different colors for each building. Color all the windows the same color, but leave some white space in them, in order to represent light reflecting off of them. Do one pain at a time, in order to make sure that you controlling the way the light is hitting it. Add depth and shadow to rooftops, remembering to add shadow, as you color them in, using a darker shade for the shadow. Keep that in mind, when coloring in metallic surfaces as well.