I think the shadows are ok.
It's your brushed metal that is so radical it distracts me from otherwise very good and realistic looking image.
If you would tone it down (does it have bump map ? If yes, the delete it), made it smaller (the brushing looks unrealistically large as well, tile it more) and placed a smooth coating over it, it would resemble the
real counterpart better.
But everything else is imho very good.