I like this image a lot. I think the only improvement would be to place the sun further from the center of the image. Then again, you might loose some of the symmetrical feeling of the trees if you did that...
This was a great subject matter that several students focused on. I was hoping to see more examples that show a broad depth of field which would have the concrete edge in the foreground in focus as well. However, I do like the way you have isolated in this image.
As you can see here, there is a wide variety of light going on in this photo. It is good practice to play with exposure levels to see what you get.