There is no doubt that such a quality model as this contributes greatly to this shot, but at the same time the light, the angle, the expression, the composition ... all these things make this a shot I would happily put on my wall in a frame.
Classic, elegant, very stylish. I really like this image.
The choice of a gentle sepia really works as well. Sometimes a great shot like this can seem so natural and perfect that one forgets it was probably taken in colour.