Darth Talon for those who don't track all the details of the assorted books and comics is a Lethan Twi'lek who became a Sith Lady as part of Darth Krayt's One Sith (so says Wookiepedia). This all happens 100 or so years after the fall of the Emperor so you can safely assume it's not canon any more and ignore it.
As shown here in this image by daRoz though she is pretty awe inspiring don't you think? Not someone to mess with unless you have a death wish judging by the look she's giving. Really moody bit of artwork and the skin looks like skin not a costume.
Source: Deviantart - Sith Girl