I think you've chosen an outstanding subject. I've looked at this several times, and although I think you've included the rocks for framing purposes, I just don't think I can make them work for me in this context.
I know that "I would do this" posts annoy some folks, but perhaps a reshoot of just the roots, either with macro or closeup wideangle would make for a stronger shot. I would personally love to shoot these roots and try to make something work, as the contours and colors are incredible- I think your decision to leave this in color was the correct one.
John