Doodles are entirely different from sketches. Ok, they're not really. Calling them doodles is really just an excuse to take "artistic liberties" with reality. So essentially whenever a drawing fails to imply a sense of realness, it becomes a doodle.
Because I feel guilty for never posting. I have some sketches from Gasworks Park, but after seeing Prof. Moerhle's, I felt they needed some work before a public viewing.