Not sure what you want for female skins.
There are the same number of head options for males and females.
During the cycle of BO2 there were a couple of discussions on having female avatars in cod. Why,,,, because there was none.
We now have the ability to use both male and female avatars. Plus, the level of customization is far greater than any previous cods.
Need to remember in Cod --> you barely get to look at yourself. There is no third person viewpoint in Ghosts. You can only see yourself if you are on the receiving end of a killcam. Or, someone has put a video package together.
If you could be more specific to what you are proposing as extra skins, that will help me to understand from what viewpoint you are coming from.