C&C per req:
1. A little too much picture and too little subject. The couple is almost an afterthought. Under-exposed by at least 2/3 stop.
2. Nice pose, good use of selective focus, but supplementary light was needed to illuminate the area where their heads are together. A strong green cast as well.
3. Nice pose, but same lighting issue as per #2. In this case the background is just too busy, even though it's soft, there's too much detail still visible.
4. Not really fond of this one; a good idea, but too much dark area in the bottom half of the image. I think a different crop might help.
Overall a good effort with some minor exposure issues which need addressing. As well, the use of a polarizing filter would have helped to give you brighter colours and stronger skies.
Just my $00.02 worth - your mileage may vary.
~John