The combination of the rich colors of the barn, contrasted with the tans and grays of the grass help to make this an outstanding shot. The texture of the siding is also appealing, and comes through with strength.
The quality of the composition makes itself felt through the placement of the horizontal fence, the highest part of the barn, and the strong diagonal of the roof. The viewer's eye is led to all the right places for maximum visibility of the subject.
I feel that the photographer has succeeded in bringing out the essence of an old building that seems to still show signs of its past glory. One can easily imagine the barn as something that the owner and builder would have been proud of, and doubly proud to see it still standing.