C&C per req:
1. Cute, but you need to move the key light so that the catchlight isn't in the centre of her eye. Also try and avoid cropping bits of hand.
2. A nice shot, but I think your lighting ration needs to be adjusted just a hair; your key light looks to be about 1/3 stop too hot.
3. As per #1; his hands are awkwardly cropped and your lighting ratio definitely needs adjustment here; on her right (camera left) side the highlights of her sweater are partially blown, and on the left, his face is in deep shadow, as well as having a case of 'racoon' eyes.
Overall, they're a nice set with only minor exposures issues. My one suggestion would be to consider clothing choices more carefully. These would be great outfits (except for the white sweater) for high key shots, but with the black background, jeans and dark clothing aren't always the best choices.
Just my $00.02 worth - your mileage may vary.
~John