Sunset pictures can be the best time for beautiful light... #1) you want the people to be exposed correctly. Right now it seems the sky is good, but her ring is not very sparkly.
#2) Not really centered or off centered. you should focus where you want them to be... they're kinda lost in the background mess. last one in the first post, his head is cropped too close to the top of the frame. When you shoot, try to leave yourself cropping room. What if the couple wanted to order an 8x10 image? You'd have to extend the background or loose part of the image.
2nd set, the kissing one would be better if she didn't have a shadow right on her forehead. Try to get more profiles in kissing shots. It's a "photo kiss" not really a real "tilted head" kiss. The profile shot looking over the water, the horizon line is going right through their head. Kinda distracting. IF you moved slightly up or down you could minimize that. The one of him holding her in his arms, It'd be nice to see his whole feet. It's strange to drop at the knees.
The BW feet shot, there is something between their legs in the background that is distracting. Why is the guy lifting his feet? If you're trying to be funny, it came across as feminine. Not the best pose for dudes. Also try getting on ground level when doing shots of feet.
mmmkay? =) Hope this helps.

