All that parametric mapping is hairy.;) Are you sure that to the right is your brow settings? Did you put a light right in front of it? Did you look at the new GI light thru trans option?(I haven't needed it and got mixed results). The problem with these long parametric mapping shaders is they have a drill down a mile long...anything in there could be affecting it.My alphas still don't come in. Maybe replace the eyebrows if all else fails.

No need to think outside the box....
    Just make it invisible.