this one is really good..
not my place to say this probably, but you might try to break the "monotony" (not that your drawing is dull, but there is the monotony of the constant clash of black and white) by saving some dark and light regions..
other than that, this one looks really fabolous!
You CAN draw like that, the #1 thing that holds people back in drawing is limiting beliefs, try reading "The Artist's Way"
and "Drawing On The Right Side Of The Brain",
they will help lots, getem used from amazon cheep too