Your white balance settings are a bit too cool, and I see some excess green in the fleshtones in shots #1 and #2. if you were to open the images and open the Curves tool, and go to the Red CHannel,and lift up the curve a bit, that excessive green would be cancelled out. It is also showing up in her teeth, which are a bit yellow. It's subtle, but the issue is there. When shooting in shaded areas, near trees or large expanses of green grass, there is often some "green pollution" from the foliage/grass. Another option to correct these subtle color casts would be to use PS's Selective Color, and correct the tooth color there, and also hit the yellows and or reds a bit, and make subtle color corrections that would make her skin look more pleasing using Selective Color. The last shot, the added one of her in the blue blouse has some unusual lighting and odd skin tones...her hair looks reddish/green in that one. Just a little, but it's clearly different in color than the other shots. You use of open shade with the subject looking toward a BIG light source has given you excellent catchlights and loads of eye-sparkle!!!