I would assume that the reason that this scored low in the "gold" challenge is the "lack" of an overwhelming gold... I mean, come on... she's not painted gold ;)! Personally I like the image alot, and I think it has a very understated, subtle and beautiful golden quality in her skin tones and hair. I didn't vote in this challenge, but had I... it probably would have recieved an 8 or 9 from me.
While beauty is in the eye of the beholder and your model is beautiful I don't think this fits the challenge all to well as there is nothing "gold" about her.