Not that anyone asked for my opinion, but I too believe that most (and probably all) of her photos were released without retouching of any kind. JMO, from looking at all of them over time. I happen to LIKE (a lot) that natural pendelous hang she sported... such a fine contrasty visual compliment to her slender, leggy frame and apparently wholesome looks (I always imagined her to look like a young Carly Simon, or maybe a Sheryl Crow ...facially).
I'm not saying someone wouldn't make a couple hundred fakes... we all KNOW of models/sets/sources that HAVE done so to varying degrees of success. I also don't believe that the TW images were authentic because I somehow WANT them to be... I'd appreciate them just as much (and maybe even more, due to the effort involved) if they WERE admitted to be fakes. They're great images and she's gorgeous either way.
I just think that the TW pix I've seen (and excepting the post-release face-swaps, morphs, etc...) are authentic.