I did this drawing of "Wild Girl" in my studio for practice.
I sketched her figure roughly at first, then re-drew her to refine the lines and shapes. I try to keep the second, more refined drawing, alive by keeping up the same energy as the first drawing. The trick is to really draw, using the first sketch as a reference, while trying to actively explain and refine your message. Do not to simply "trace" over your sketch with a cleaner line, the line will lose it's life and the drawing won't contain your full creative energy.
Now, go draw something!
For the art geeks: Pencil 6B/2H on 11x14" tracing paper.