I agree with lulugus. The lighting IS better adjusted in #1 as far as the background goes, but she looks dark and there's no contrast in her tones. I could easily fix that, but the sunlight shining on her makes it very difficult to work with as it takes away from the flexibility you otherwise would've had on her tones. The contrast was good on the top set though. Your Post Processing wasn't bad, it was more the lighting and positioning more than anything. Grant it, your PP skills can always improve and even after doing it for as long as I have, I still need improvement, but you're off to a good start in regards to that.
Lulugus and I definitely share the same opinion though.