Lightning Question (shader, lightmap or blender UV issue?)

Hello,

I have the following scene

As you can see the ball in front of me has a very extreme shadow on it’s back. How could I make it less extreme? I would like to still see the triangles that compose the Ico sphere but darker and without having to change the sun’s position.

I tried to play with my light values, shader value, changed shaders, etc. but without any success. I guess I’m lacking some basic knowledges regarding lightning. Any help / tip would be greatly appreciated!

Thanks.

You may also decrease the intensity on your directional light.