This is an excellent photograph. You've nailed "rule of thirds" perfectly and given the viewer an interesting photograph besides. The subtle, almost invisible horizon and the fade away to black in the foreground create a striking effect.
Your model's face is in shadow, and that tends to pull attention away from it, as the eye will tend to gravitate toward the brighter areas of a photograph. A reflector or fill flash may have helped with this, and given you that little extra push necessary to make the top 10.
lovely...I like borders, but feel this one might be a little thick and distracting...it screams for attention...perhaps something half the thickness would have been perfect