It's a very nice image of the mill. I agree with the others about the branch, and the foreground weeds. I think the rocks by themselves would look fine. I think a single original RAW would look much the same. In other words, I don't think HDR would change that much, especially at 1/3 stop bracket. Anyway, my attempts with Photomatix have been somewhat disappointing, so I commend your excellent result.

