I like the overall soft tone of the finished image, giving a nice dream like feel. And I quite like how you handled making sense out of what she was wearing, working with what you could and creating where you could not

Your airbrushing work is great.
The only thing that looks a bit off to me is the line of her cheekbone and jaw on the right hand side of the image. It appears that the shape of her face has changed from the original image.
In cases like this in the past, I've used a technique where I have laid a sheet of acetate over a copy print (never on the original) and with a rapidograph pen, free handed in the facial features.
I then used this guide as I was working on a piece, pausing and laying it over my work print as I was going.
I have managed to use this method in
PS with good effect by doing the same thing on a transparent layer, and cliking off the eye when I did not need it. The nice thing about doing it in
PS is that I can vary the opacity of the layer to see how I am coming along.
I have also been creating a "swipe file" of things like eyes, ears, hands, feet from other images...so if I need one, I can pull one that I can piece into the image.
Best thing my art teacher ever taught me to do.

When I get stuck, I literally "swipe" the part I need from my collection and use it directly in the image, or keep it up on the side as a guide for my work.
Good job on a real toughie!