I don't really have the time to create something of my own, so I thought I'd bring you others' visions of Gabrielle :
Theatre des Vampires : Gabrielle de Lioncourt - this page introducing the Marquise has a lovely pic by Dan & Dany, and one from the Innovation comic books.
female vampires - by Isabelle Hultman, on Elfwood (Gabrielle, Claudia, Pandora, Maharet/Mekare).
Gabrielle, manga style - by Gracia 'Gengar' Soria on Elfwood - I think it's my favorite
Gabrielle by Pippa Laskey - on Elfwood, manga style, funny
Enchanted Oaks - fan-art. There's a Gabrielle portrait on page 1, as well as one of Gabrielle with Lestat on page 3