Hi Pete....I'd really like to be able to step back and look at this from a few angles, but, for me, what works really well from the angle that you've photographed it, is the way that the irregular shape of the piece of standing root mirrors and compliments the shape of the branch.....I think that they are in really good balance.
Greta piece, I must start thinking outside that box that I got stuck into, 20 years ago!
Les