2013 First Sketch of the Year

I bought a fresh Sketchbook for the new year and thought it would be great to start the year and grace my very first page with a strong drawing (for me anyway). I figured it would be a benchmark for the pages afterwards.

For a reference, I used a photo from a fellow Deviant, one of my favorites, and here is the original:
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It is not an exact representation. I omitted the dress texture and changed the head angle a tad, hoping she would turn out just a little more "Marilynesque".