The Millennium woman figure has two methods for eyebrows. The parts of the head mesh that are assigned as eyebrow materials (the method used with Posette) are already completely smooth on the forehead. These brows are already in the correct place on the main head texture map. So there is no need for a 'smooth eyebrows' morph, or a remapped head. Pretty handy. The second method uses a detached little mesh that can be hidden inside the head, or moved out in front. This is the one you need to apply the transparency map to. I suppose the chief benefit with this method is that it's very easy to change the eyebrows without altering the whole head map. Since there is a complete lack of any pubic detail on the mesh or on the texture map for Millie, maybe it was originally the intention to have a seperate little mesh for that area too... :-)