1) Your picture style of standard is causing the contrast to be a bit higher than it should be, and it is saturating the red channel a bit too much IMO, try switching to neutral, the colors will look more normal, and you can add saturation and contrast to taste during post.
2) The white balance, from what I can tell on my calibrated monitor, isn't all that far off. I think the greenery might have thrown off the metering a bit perhaps, but I didn't really have to warm it up much past what it was set at in Auto.
3) I think the skin tones are going to stand out simply due to gray suits and the scenery, at least in that pic.
My thoughts anyways, the biggest change was going to neutral instead of standard for the picture style. I would make a custom one that used neutral as a base, add 2 to sharpening and 1 to saturation. That is what I did below from before (your raw) to the after (neutral picture style, add 2 to sharpening, 1 to saturation). I did also slide the white balance to 4500K. Without shooting a custom wb before the shoot, I am not sure you will get great results with Auto WB. They may be close, but will probably still require tweaking during post.
One more minor catch, you shot this at f2.5, per the exif, and with such a long line line of gentlmen, I would have probably moved up to f4 personally. Unless you have them perfectly lined up parallel to the sensor, you aren't always going to guarantee they are all in focus (like the gentleman to the far right on the full image). Just a minor thing though, hind sight is always 20/20. 
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