Bambi...hands down. She's even better than mainstream models (fashion, swimsuit, runway, etc.). The brunette hair is a nice bonus, but she was great as a blonde too.
Who could make it as mainstream model? Well, let's assume then everybody under 5'7 is out of question (Nella, etc.) And we strictly talking about looks, not IQ or morale, professional behavior, etc.
Sarah Twain
Regina Moon
Gilda Joy (former fashion model)
Bambi
Milly Jay
Sandra Shine (used to be fashion model before her porn career)
Nessa Devil
Jennifer Stone
Melissa Black
Claudia Rossi
Veronica Clinton (Actually she's about make it now)
Jane Darling, Angel Dark, Tarra White are all gorgeous but in my standards they're too curvy for mainstream modeling.
Well, that's an easy one for me: Anetta Keys.
The one and only.
Unfortunately, she's doing no more hardcore stuff, but ... I think she's just teasing us ...