Without seeing the Material Room set up, that line above the lips may be a transparency mask with hard edges.  Those edges should be feathered smoothly in Photoshop or 3rd party graphics program.  Also, it appears that the skin textures are casting a bluish tint, an indication that there is a blue color chip on the PoserSurface node.  That is not a correct procedure but, then again, I don't know how the texture shaders are created.  

We really need to look into the Material Room for some answers.