You need to find the right balance between GR gain and skydome gain. Radiosity gain will brighten the scene, so the higher the gain, the brighter, and the more skylight gain, the more you allow sky light to enter the room. It might look better with a ahigher sky light gain, and a lower radiosity gain. You also need to crank up the GR slidfer and the advanced effects quality boost in the render options.

Are you using SkinVue? If so, might simply be too much SSS in the skinvue parameters.