I'll offer my input on the 4 pictures you've posted. White balance seems to be a consistent issue for you. The first photo is too green, for sure. Shooting RAW is the easiest way to correct odd white balances in post, but just because it's a JPEG does not mean it's beyond saving. Below is how I have altered the colour balance using Photoshop, the difference should be quite striking. Sometimes you'll want a portrait to have a cool white balance if you're trying to convey a particular mood, but very rarely will you want a green portrait. If you want me to go through the Photoshop adjustments in more detail, let me know.

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