Hmmm... ok let's see what I love in this shot. First of course, the tone. I can't really explain why but the tone seems to be perfect for such a beauty, it somehow made her more beautiful. The next thing that I like is the way she turned for the camera, quite a unique perspective, if that's what you want to achieve and you did it well.
And I believe you used a natural lighting here, coming from that window in the background. Natural lights, such as coming from windows, as far as my experience is concerned, is always the BEST choice. Here, it highlights her hair, a little in her face to give detail and on the cloth around her neck. And I really like the way she looks at you, when you look at this image, your eyes goes directly straight to her wonderful eyes, which seems to communicate to the viewer and that is very important between viewers and the image. communication.