Here are some simple "step-by-step" techniques for creating an illustration using a SketchUp model as a base, your creative imagination and a splash of color markers. These images and more are included in my upcoming Second Edition of Drawing Shortcuts, being published by John Wiley &Sons in December 2009.
Step 1: Make a SketchUp massing model. This simple massing model was constructed with a few people and entourage elements to give it scale and to select the eye-level perspective.
Step 2: Redline Mockup. Print the model view on letter size paper, then sketch all of the drawing elements in red pencil. This includes landscaping, street furniture, building facades, lighting and distant architecture.
Step 3: Line Drawing on Trace. Tape a sheet of tracing paper over the redline mockup and then trace all of the drawing elements with a pencil or pen. In this drawing, I used a Pilot Fineliner Pen. Scan the finished black and white drawing at 300dpi before adding color in the final step.
Step 4: Final Colored Drawing. Color was added directly onto the original ink drawing with Chartpak AD markers. Because the trace paper is thin, I applied color to both the front and back surfaces of the paper. This prevents certain marker colors from bleedinng into each other. Scan the final drawing in color at 300dpi.