I think the best part of this piece is the fact that you've captured the natural framing of the situation. By having such a tall shot, you are able to show exactly how well the landscaping has been sculpted to create what is almost like a portal. The small white spot in the middle is great center point, and the soft lighting has wonderful blue shades.

If you wanted to retouch this piece, I think you could potentially edit out the small man-made markers on the bottom sides of the piece (the white markers, and then the road sign). I think you could really play up the almost mystical quality that you've already found.