This photo attracted me by its simplicity. =ScorpionEntity shows us that a portrait doesn't necessarily involve fancy clothes, glamorous make-up and so on. Instead, he emphasised the purity and pure beauty of the model, focusing on her eyes and facial expression.
The model has a calm posture, she's not posing in any way, which makes the photo look natural, just like a spontaneous shot. Her eyes are the main feature of this picture, as they express so much: an almost surreal feeling is given by the posture, and the best word to describe it is purity. Natural beauty, unfortunately, is underrated, as artists use different tricks to emphasize models' best features. But in this case, there's no need for them, the peaceful look goes towards serenity.
You might consider taking a look at this photo, because we are surrounded everyday on dA by manipulated pictures, and sometimes there really is a need for the natural, which calls out the human part in us.