This is a lovely subject, with potentially great texture, but I think you were competing with seasonally flat light, and that you have perhaps tried to force the contrast too much to compensate.
The potential of this lies in all those mid-tones, and the texture. I suspect you might need a revisit in better light to meet that potential.
An aside - I am perhaps one of the few here who is really only interested in commenting on B&W, but very few posters use the B&W flag. It really helps when you are trawling for mono work.
Edit - I have just looked at the colour version on flikr, and I think there are B&W possibilies here. I see that you have cropped in an attempt to pull the structure off-centre, but I feel that you have just lost something in the composition by doing that. And I think that you just need to haul back on the contrast slightly to get those mids.
