Very unique idea...if I might make a suggestion, if it were mine, I would greatly darken the image so the inside of the tunnel and leaves was deeper and richer in color which would also add more impact to the light at the end...would also crop off alot of the bottom edge so to just focus on the tunnel...that aside good effort and very creative.
I like this image very much. Truthfully, I wouldn't want to put my arm in there, though. Still it's very unique and must be viewed large to fully appreciate it. Nice concept, and a good capture too!