Now, remember, this is purely my opinion:
Aspect ratios should have nothing to do with the image. All it does is to lock something into a shape that most times is not the optimum shape for it. I love the image but find no reason to insist on keeping it square solely because you like to keep ratio aspects the same.
The subject should dictate the overall shap of the image.
In this one, i think a bit of cropping on the bottom would help it..not a large crop, mind you, but a bit of a chop would help it. I would say just a bit above your signature.