I don't think that's what Gaz officially looks like as a woman. Remember in "Dib's Wonderful Life of Doom"? Zim made her look that way in the holo-future of Dib.
Zim: Hmmmm...maybe I should make Gaz beautiful as a woman. After all, I love her in secret...
Looks like Zim's got the HOTS for her! Anyway, cool pic! Keep up the good work!
I think it looks great, and the background skulls are a nice touch.