I love the way the darker colours of the wall accentuate Annas lighter skin tone, and in turn bring out her blushed eyes, pink lips and dark-pink nipple. The use of the warm light allows the image to retain a sense of home-like welcoming, welcoming the viewer into the shot. The softer, golden lighting also allows Anna to blend in with the darker background, instead of standing out against the wall with stark contrast.
The placement of the light, and the consequent shadows, elude to a sense of intrigue and mystique; while it can be seen Anna has a beautiful face and body, her hair falling around her face and her raised arms casting a shadow leave room for us to use our imagination, all the while keeping us wondering about what really does fill out the shadows. To add to that, the shadows create an amazing depth (I feel stretching out, away from the wall).
Finally, I'm drawn to Anna herself, her body and her face, her expression and pose (and poise!). Her arched back, bent elbow and the nonchalant state of her hands (very casual, not clasped, clenched or open stiff), portray Anna as being relaxed and 'chilled out', completely enveloped by the pleasure of air on her bare skin, the feeling of freedom from the constraints of clothing, the releasing of tension in her stretched limbs, or all of the above.
Of course, to say any more about Anna would be more bias than objectivity allows (I have a soft spot for stunning brunettes), So I'll conclude by restating my introduction.