#3 and #4 are good and successful. #3, the hands and ring shot, is simply beautiful. My problem with these shots is that the woman has a beautiful,natural smile, and the man has a very fake-looking, practiced-since-his-mother-demanded-he-smile-smile that is a remnant from childhood admonitions to, "Say cheese!"
The man just ruins the shots where his forced,practiced-since-childhood smile is his expression. His expression looks bad,contrasted with the lovely young woman's very real-looking,easy smile. Like, in shot #2, you have smartly put the woman in front, and her face,hair, and torso are the main subjects---she fills the space, beautifully, and then hubby peeks in over her shoulder...and his expression does not "jibe" with hers...his expression kills the shot, for me at least.
I think he could have pulled off somber or "friendly" expressions, but a forced,practiced smile is perceived by many as a lying smile. He's clearly not at ease--he's not a good picture-taker. He's uptight in front of the camera, and this is the toughest challenge you'll need to learn to overcome, dealing and interacting with non-friends and people who come to you for photography. Many,many times, you will encounter men who are absolutely petrified at being photographed, and this guy is a good example. He's constantly looking at the camera, forcing the smile, as he does in shot #5...she's looking off-camera, he is staring straight in to the lens, waiting for the shutter to trip...
On couples like this, one thing you can do is to allow the woman to "lead" a bit, and flirt with her man, and photograph them interacting with one another,and not looking directly at the camera. Set them in to position in front of a good background, back off, and photograph from a distance with a telephoto or tele-zoom, or whatever. He'll probably smile genuinely for her, when relating to her, but not for the camera eye.
This is a situation that will probably occur as long as there are couples and cameras.