From my understanding with BB's Envsphere, unless the image placed on the skydome is an HDRI, the gamma settings should be turned down to 1 in the shaders, leaving the render gamma at 2.2. 

But with IDL and a skydome you will see the skin reflect some ambient light.  You should use BB's VSS skin Shaders.  The blue is most probably from the blue tint on the Diffuse_Color chip.  Change that to white.