V2 has two eyebrow materials: "Eyebrows", which are part of the head mesh and use the painted on eyebrows of the head texture, and an "UpperEyebrows" overlay which uses transmapped eyebrow textures.

You can use both or any one of them.

To use both, your head texture needs painted on eyebrows and you need a matching transmap for the upper eyebrows. Very few V2 texture sets had that.

To use only the eyebrows, you simply make the upper eyebrows fully transparent or use the "BrowsGone" morph you find among her head morphs. This is how most V2 textures are set up.

To use upper eyebrows only, you need of course a transmap and a head texture without painted on eyebrows. This is very useful if you want to easily change the eyebrow color of your figure.