I am including what I consider to be a Unified Field Drawing.  I tried all sorts of goodies on this piece from oil pastels, India ink, Sharpies, watercolor and watercolor pencils, and salt.  Nothing will layer over the oil pastels although the ink filled in the white spots.  I used lots of different strokes, methods and experimentations.  The kids have decided it looks like a beach and an island during a torrential rain storm as night is coming on.  I was just making travels across the page as I read in one place to do.  It's kind of interesting!?  I wish I had been a little more aware of doing different areas with depth either with strokes or tones and values