To be honest. All 4 of the shots are overexposed and I don't really see "quality editing". You mentioned twice in your post that you have learned all this "quality and proper editing" but I just cant see it. Sorry that I am the first negative comment. I don't think the photos themselves are bad or anything, they just need some work. Seems like you have a tendency to overexpose your shots, so watch that. Adjust the levels/curves and they will look much better.
Ekkk...Hope I didnt sound TOO harsh. lol
Just my opinion
I actually agree with mstone on her post.
In order, here is my opinion on your newest shots:
#1, Not overexposed or underexposed, and the composition is fine. I just think that the colors are a bit dull, and that there is a lack of "blue" to add to the green. This makes no sense in text, but here is a link to a very quick edit I just did so you can see what I'm trying to say: Number 1 Edit
#2, the left arm and chest area is a bit overexposed. That's due to the sun light coming in from the left. I suggest getting a black cloth to eliminate light that you don't need next time... Her face also has absorbed some of that green tint... The crop is nice, but perhaps a little bit less of the top.
#3, Too much light hit your subjects body. Her left arm, chest, and head is a bit overexposed. Again, you got more light than you needed.
#4, This one is good. I think a bit more emphasis on your subject would be better, by cropping a bit tighter. There is a bit too much space around your subject. Too much on top, and too much towards the right hand side of the image.
If I may ask, what was the editing that you learned from your photographer friend?