Like people before said, it is a bit blurry...also the lighting isnt coming from anywhere, refine the edges along the arm, outline it with some type of lighting to give it shine. Other than that it's ...
Hold on a minute...you can't "LEARN" anything from a book, at least not to the full extent. Drawing is like any other art out there. Sure I could go grab a book on anatomy and read it but then can I ...