In another attempt, I started this one with the darker shadows and gradually moved into the light. Some parts came together but others looked spotty. Think of a cheetah or Dalmatian. I ran out of time and needed to wrap it up so I decided to smudge all of it together and this was that produced:
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http://browse.deviantart.com/traditional/drawings/landscapes/?q=sea&offset=168#/d2gobpy
http://browse.deviantart.com/traditional/drawings/?q=charcoal+nude#/d1bgml1
http://browse.deviantart.com/?q=charcoal+nude&offset=432#/d4p69ha
http://www.jrheilman.com/if/sa/pf/charcoal