It lacks a good attention grabber. I'm torn between looking at the inside or looking at the outside. I think the outside is better, but there just isn't enought of it..
When I see the blue sky and the trees I really see an opportunity for a really nice photograph. Of couse, I haven't been in this place so I can't say for sure but I think that if I were shooting at this location I'd take a photograph of this barn with a long lens (100mm?) at a distance and keep the barn to the left of the frame and use the remainder to show the nice trees to the right of the barn and the beautiful blue sky.
As for the picture you chose to photograph instead I believe it would have been much better if you had shot the open barn door straight on. Think about it, what purpose does the tree and the blue sky serve on this photograph? Do they add any 'value' to the picture. I think not.