This is one of my fav. subjects, and have stopped there 3 or 4 times since finding it origionally. It's interesting to watch it deteriorate in the images that I have of it, and yours (haven't been there in 6 - 8 months or so)
This is a great image of it, and knowing exactly where you were standing makes me wonder if I should have stood there last time I was there. I think your over sharpened comments may be from a larger than normal amount of contrast, which makes it look over sharpened a bit. Your ISO being higher than what I normally shoot, makes it difficult for me to be sure. Great image, and hopefully you and i stay off the same subjects for future challenges, as I almost went back out there and reshot for this particular challenge.
Subject Impact: Nice visual impact
Meets Challenge: Meets Challenge
Technical: Average technical form
Composition:Cropped in a little tight and could be in better focus
Creativity: Good Idea