For me the main focus is the eyes: the way Aya is looking directly at you in a yearning manner, yet at the same time the way the light reflects off those brown pupils draws you in and takes you away somewhere special. To quote the Beach Boys "Good Vibrations" - "I don't know where but she takes me there".
You get the impression that Aya wants to tell you something but she's not sure if she should. Add with the reddish-brown tone to the picture, you have something that suggests warmth and intimacy yet you keep but feel Aya is somewhat distant from you, just that little bit out of reach every time you move in to kiss those soft, wanting lips...