#2 is my fav--it definitely has the most intimate feel.
#1, they seem really far apart vertically, he's towering over her.
#3, I like except their hands. For some reason it feels awkward to me.
#4, I think she's much prettier with a smile on her face. And I really struggle with this type of pose. It feels natural for the guy to have his arms around her waist, but no matter how you do it, it just looks awkward!! He's hunched over, and I hate that!! LOL
#5, the expressions seem most genuine in this picture. They both have really long faces, and a portrait crop seems to accentuate that fact.
Overall, the skin tones look great, and I like the brownish background with the green outfits. His teeth could use a tad bit of whitening to bring them closer to hers. Her "T" zone and tops of her cheeks are tad shiny in some of them, and she could use some "smoothing" of the lines under her eyes. I do like the vignetting.
If they were looking for that professional studio flavor, I think you nailed it spot on! Good looking couple!