DNMC. This is a tough shot - shooting into the sun. Upper left is blown out, right side is underexposed, so on average... No particular focal point of the picture.
The sun in the corner is over powering...actually blinding. And you have nothing in focus. The huge glare mark also takes away from the photo. This was already a way out of the box entry for natural light portrait, but the other things just threw it way off.
A portrait usually implies a person as the subject. The glare from the sun and the reflection in the lens also contribute to a lower score in this image.
Oops... forgot to put the person in the portrait. (I bet you've received too many comments to that effect already, so just ignore this one and carry on)