This image, with the model's eye gently closed, reminds me of deep thought. The way the background is blurred makes it seem like she's concentrating on something. This is further supported by the narrow depth of field, which draws much attention at the model's eye.
I think there's a good amount of contrast and balance to the image, too. The darkest part of the background borders on the lighter parts of the model's face, making her really stand out. The bokeh to the left of the frame contrasts with the dark lashes and eyebrows on the other side.