I am with Marko on this. The colour cast is obviously the major issue (as you worked out) and they do look little too processed to me.
AT - I am more than happy to look processing issues any time you want, and also dont mind at all doing it, but I am also very conscious of getting you comfortable with doing it yourself. I find the only way to learn all this stuff is to try it and try it again. So if you are up it for it this is what I would do.
If it were mine I would go back to the original raw and start again. Firstly beacuase you have the white dresses I would set the WB by using the neutral colour picker on the white of the dress (not by using the presets or sliders). I think this will give a more natural result. Try a couple of different areas on the white dress if you dont like the first result. To be honest I dont think they need much more processing than that. Maybe look at a levels or curves adjustment (start off with auto and see what it does), perhaps a slight sharpening, and maybe VERY SUBTLE vignette or burning of the edges (so that someone looking it without seeing the original wouldn't even notice).
I think if you do that you may have some really lovely shots of the girls. I love the set up, particularly the swing shots.
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