SO, I'm very much an amateur, so this commentary might not be worth anything, but this is my opinion:
#1 and #2, I just don't get. Lots of hard edges, as if the originals were miss-exposed and OOF and they were heavily sharpened in post.
#3 is better, but clipped blacks
#4 is in focus, the eyes are sharp, the colors are great , and the overall look is lively. I like the lights in the horizon in the background - too bad there aren't more! There is good DOF and the short-lighting from the OCF is great! Sometimes just a real simple portrait is the way to go.
#5 looks like a very good attempt at high-key. Eyes don't look 100% sharp, but that might just be the re-sizing and compression. I like this photo a lot! I'd kill the logo, or at least tone it down, color-wise. Too blue, too eye-catching.
#6 I get the intent...Would have worked better not QUITE so shallow DOF. Also, what are you trying to say with it? for an E-session, if you're going to shoot something that thin, with the couple OOF in the background, it's best to have the focus on the RING placed somewhere in the foreground. Otherwise, it's a picture of some wood grain.
#7 Nice image, still think there's too much clipping and hard edges
#8 is real nice...I don't care that it breaks a lot of photographic rules (level horizon, some eye contact with the couple.) I think the mood of the photograph speaks to them having a quiet, private moment on their own. I wouldn't, say, use it as a stand-alone portrait, but it's part of the story that's being told, and that's why I like it.
Overall, I would say back off on the processing a bit. Somewhere, someone decided that portraits should always have a vignette, and I don't agree - seems a little gimmicky to me. You have a good mix here of some simple portraits, and others where there is some experimentation with style and composition. I think the couple will be pleased - ask them which ones they like the best, and what they like about them, and then also pick which ones you like, and ask yourself what you like about them. I think that will go a long way in helping you develop your style.