I don't think this kind of lighting is flattering. The lighting is a bit too dark and cool in color temperature in the shade in the first photograph--the lighting tends to look kind of "blue" unless you elevate the in-camera White Balance setting to 6,500 to 6,800 degrees or so, and that type of open shade produces kind of dull eyes,without catchlights.
In the second shot, with the very strong sidelighting, that makes people tend to squint,and again, her eyes have no catchlights, so they look dull. A tiny bit of fill-flash, like from the pop-up flash, even dialed down to 1/8 power, would give a bit more eye sparkle.
The third frame looks a bit greenish, like the lighting is influenced by lots of trees or green grass, which happens quite often outdoors. Selective color could help in PP, by adding a bit of magenta to the reds, to offset that slight undercurrent of green.
The last photo has a rather extreme camera tilt...that just does not seem very natural to me. I'm also not a big fan of that type of dappled sunlight...it's hard to work with on a number of levels. I think overall you need more fill lighting, which you can get by finding another location, such as a place where a light-colored building bounces the afternoon sunlight off of an exterior wall...or by using a flash either on or off-camera, or by using some type of reflector--bed sheet, Foam-Core board, home-made cardboard and foil reflector, whatever. ANother alternative is to diffuse DIRECT,angled sublight by stretching some type of scrim (aka a "silk" or a 'panel') and placing that fabric diffuser in between the afternoon sun and the subject, creating your own sort of natural softbox lighting,and then using just a tiny amount of fill-flash or reflector to create eye sparkle.
I also think you ought to turn the camera vertical, keep her shoulders angled to the camera, and position her a bit farther in front of the background,and use a little bit longer lens focal lengths, to soften the backgrounds and to improve subject rendering.