Pencil Drawings - Draw using Reference

Drawing using reference is ok. Most illustrators including myself need to use any reference to draw something unfamiliar. It is a process of teaching your brain what lines you need to do for the structure you're trying to create. As you see in the drawing below, I've looked up some images of school buses.  I then chose to use the traditional bus and mix it with a newer face of a bus. Added the typical black stripes located on the sides of the bus, and there you have it. A slightly confused man who sees the bus thinking to himself "...but today's Saturday?!".