The lighting is soft and diffused and does a great job of wrapping around your features. The pose does a great job framing your face, as does the shallow depth of field of the focus. Additionally, your hair and the almost nonexistent background also serve to frame you perfectly and keep the viewers attention on your face.
Your eyes are perfectly focused. Your lack of clothing and limited jewelry further keeps the viewer from getting distracted; however, the "snowball" earring is bright and does compete for attention with your eyes. I feel if this shot were redone, that earring should be removed. That is the only negative item I found with this picture.
Finally the most important aspect of this image and the one that compelled me, is your expression. It is amazing. It is haunting. I am drawn into your eyes and when I look into them I feel a profound sadness and longing. Maybe some special love is gone, or has left. I don't know, but I can almost envision tears. Maybe I'm reading too much into it, but it is that beautiful sadness that touches my soul.