Well as the title says if anyone could do this for me and anyone else who needs/wants it.
Female Combine Assassin: http://www.garrysmod.org/downloads/?a=view&id=24217
I was thinking about Heather from Silent hill 3 as the head that is replacing the helmet.
Heather from Silent hill 3: http://www.garrysmod.org/downloads/?a=view&id=39263
If your having difficulties doing so, please feel free to use what ever replacment head you wish, as long as it is female, and decent looking.