OK, this image explains what I'm seeing here. I was wondering how the background was so bright and the models were looking under-exposed and flat. You've pasted the models onto a white background as shown by the hair. Not a bad job but it shows overall. The models could use more light and perhaps a white-balance tweak to get rid of the very slight green cast on the skin. Also, I had inquired on the gallery main-page as to what camera you were using and I'm assuming it's digital (?). These shots would seem to indicate you could utilize a better camera. I could be wrong. It could just be low-rez jpegs with an already nice camera. It happens.
You're onto some nice work here.
Could you post a straight photo, unaltered and maybe describe your light setup? You handle the subjects well but could improve your lighting/setup. It's really a small thing that would make a big difference IMO.
