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I cropped it a little tighter. The white balance seemed off to me, so I adjusted it in Photoshop's levels menu by clicking the gray eyedropper on stuff that should have been gray. Then I selectively brightened a few faces, and cloned out some distracting stuff in the background. Here's my revised version for comparison.
Thanks, Frank. That is an improvement. Since I was away from home I had to edit on my laptop, so wasn't able to judge the colors as well. The additional cropping helps, too.
I generally use curves to set the white balance, using the black and highlight droppers to set the endpoints. I often have trouble with the grey dropper, however, as it is very difficult to find true grey in some images. Your choice is very good.