Thanks for the comment. If it was a big black void in the bottom, I'd crop it right away! However, it's not a black void. If your monitor is properly calibrated (check the gradient bar on the bottom of this page), you'd see that there are details in the bottom of the picture.
I usually don't care for big empty skies as breathing space in a photo, but this works well with your image. However, your silhouette park study improves once you crop the blank black void at bottom (yep, another pet pieve!). Cropping about 80% of the blank black space restores to your photo much needed tension and drama.
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