That looks like a nice start Kevin
I agree with Michael on the harshness and I think he has good sugesstions.
You may also consider raising the strenght on surface parameter in the enviro light.
Default = 1, try to set it at 1.5 or 2 and see how it looks.
One technical thing on your rendersettings:
Detail blending is only meant for animations.
This setting blends subdivided geometry between frames to avoid popping etc.
In still images you won't need this setting.
If you disable it I think your render will be about twice as fast