The horseshoe is indeed a nice touch, but I have to tell you, I would have loved this pic even without it! I like looking at that old wood and the way the window was built.
This photo reminds me of home because there were a lot of buildings like this around were I lived, "Back in the woods up the hallows." I miss that area now that I am the middle of the cacti and sand in Phoenix AZ. The shot you got here is amazing. The age of the wood along with the ability of just finding a window that age you could even partly see through. If you did this in Photoshop,you did a great job because it looks very real to me, but if you got the shot straight with the camera, even better job IMO. Kudos to you for getting this one, keep up the good work, from what I have seen, your on your way.