Looks pretty good!
to help with shading try to pic a light source in your picture, and then shade from where you think the light would create different shadows etc.
or
if your new to the shading thing, try looking at the picture in the book, try to notice the different shades of light on it.
i'll try to see if I have the book laying around here somewhere....... but my computer room is like a war zone X_X
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