I think you did a geat job of achieving what you set out to do. I am impressed, however the image actually distubs my eyes ??
I feel it is the overall brigtness and she sheems a little soft - If I had this image to work with I would be trying to achive greater contrast.
I have not been competely successful at shooting white (as my whitepaper usually ends up a bit grey) on white effectivel yet yself so i am not about to make any suggetions