http://photoinf.com/Golden_Mean/photo-adjuster.html. I think you will find your attached image follows the Golden Mean a lot closer than you realize.
I agree with Roger, however, I don't like refer to them as "rules", I would prefer to think of them as "principles". The "Rule of Thirds" is just one, there are others. Most of these have been known from ancient Greek times, and have stood the test of time, simply because it brings about order, which the human mind seems to crave. Just like without realizing it your image follows the Golden Mean.