I like the fact that this image is not retouched or significantly manipulated, and simply depicts the reality of this model's magnificent natural beauty. To me at least, this is far more appealing than a heavily "photoshopped" image.
I really liked this from the very first time I saw it. Her expression and pose is so nicely on the edge between not being sure if this is gonna work out nicely and still so full of confidence in herself and the photographer. The part of the wall seen between her legs is (technically seen) a bit too bright - you could've done something there during development, but as a whole this is an awesomely beautiful picture.
looks like you were in a hurry to get her on film. not that it's a bad pic. it's not. you can still see the imprint of her bra. next time you might ask if you can massage the lines out before shooting.