Unless a photographer has a very extensive wardrobe to work with and a makeup/hair person who is very familiar with goth styles, the shots will come out phony looking and will look suspect to the trained goth eye. Its a lot more sensible to do it like Ian sez and use an authentic "goth girl".
I webmaster an AVS site for one of the larger goth club promoters in south florida. (
http://www.masterpastor.com ). He has a constant supply of goth girls that are looking for work. If you really want authentic goth stuff shot for you, hit me up.
ICQ: 165175908