Do you see in HughGuessWho's version he has lighten the shadow areas and you can see more detail but, what has happened is that all those branches in have now become hard on the eye and just all blends in and looses depth.
This is what i was talking about why in bs0604's version the darker shadow worked well because its not as hard on your eyes and has more depth.
Sometimes you have to do what the eye says and not what reality is supposed to be like because truth is there is color in shadow. shadows are really never completely black unless you are in space.