Interesting shot! I think though that there is too much negative space (the black around the entrance of the pipe) because what people are looking at is not the black but what is outside the pipe. You want them to see more of it!
after i was sorta harsh in the last one... i wanted to just quicly say that this one is awesome.. very creative location... and your timing was perfect... agian you dont want to center the subject... you can fix this by cropping... all in all good job
wow this is cool.... and i wouldn't want to be in the pipes taking the pic, sooo good for doing it for me... haa haaaa... (can only think of spiders... shudder)
i feel like a peeping tom with this view... great idea!