Push those lights and darks, push them farther than you think they need to go. If you don't have them, go to an art store and get some 2B, 4B and 6B pencils, they are very soft and will push those darks. Try to avoid the standard #2 (equivilent to a 2H) for the bulk of the work.
By the way, nothing is a more "classic" subject than the female nude. Never feel ashamed to draw one.
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If you have any poo... fling it NOW!
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