Well, it has been mentioned, but..
Too many lights.
Way too many lights.

Render with Gamma corection ON
Render with IDL to ON

Start with ONE single infinite light... YOUR SUN !

Use ONE single infite light to "play" SUN => There is ONLY one SUN shining on us.

Even in your preview, I see that all shadows are in the wrong place for the position of your "sun".

And from what I see ?
When rendering, all other lights, light up the places where the "realistic" shadows should be. => Results? No shadows left over.

"Think light".
"Be light".

Think shadow. => Be shadow. 
Remove the light that is shining on you. You should be in the dark as a shadow.

ONLY Indirect Light should be able to reach you as a shadow.
Think Vampire; they fear the sun. They fear direct light.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!