I'd fix the slight lens distortion so the vertical lines aren't all wonky. Then tweak the crop. Finally, adding a little mid-tone contrast (to taste) can add a little more "pop" to the individuals. But that is a taste issue.
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I don't usually post pictures, but when I do, they are of squirrels. Here's one solution to busy backgrounds: 500mm+1.4x. I think I went overboard with clarity on this one but it is what it is...
(Info: Cropped to 5x4 + rotated, 7D, f7.1, 1/160, ISO800, hand-held)