Oh, as an artist you should always follow your heart. "Golden mean" is very often a "head thing", though, when we want to rely on existing formulas, hoping dearly that there's everything to it, but the real magic is finding out where this perfect ratio wants to mean something on the image and what it should fulfill.
Example, the human proportions reflect a certain ratio all over the body. Eyes to head, fingers to hand, torso to legs and so on. Place a character in a scene and all its "perfect" ratios provide a certain harmony. The hat is small enough of a detail to be an element to the bushes, which could be placed there at a golden ratio to the brushes rather than to the entire image. Everything would gain strength, rather than being stretched thin by one element that makes one look around in hopes for reflections of the same ratio elsewhere, without being able to find it, you know.
It emotionally flattens the image.
Now, I'm not trying to persuade you or argue, but simply find it exciting to observe and analyze something with so much beauty to experiment with the chance of gaining yet some more, you know.
It's a great lesson or exercise for all of us, if something is as inspiring as your mouse-masterpiece.... (still incredible to me! My wife was stomped as well! Ugh, that does sound oddly wrong?!)
