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I very much like this picture but I am wondering whether the visual

impact could be enhanced if I cropped the righthand & bottom part of

the picture to increase the symmetry. What do you think?

I think if you cropped it as you suggest, you'd lose some of the sense of scale. As it is, its a nice photo. On small thumnail, it looked like a man standing in the sky, which would have been a really decisive moment:)

This is a beautiful moment captured, congratulations! The image is very close to 5x7 aspect ratio. I think it should be more square for maximum impact--perhaps 8x10 aspect ratio, or fully square. I've attached an example of a square crop.

Great capture,(nice to see the reflection in the building also) i've tried this to add the extra element to my architecture shots but the birds were too quick. The square crop from the commentor before me is the best for the impact for my taste.