Nice shots, lets dwell deeper:
1) Nice composition. The guys face look underexposed, just a little bit. The Florida tag on his right is disctracting. Keep an eye out for details when shooting. It's the little things that you'll notice AFTER the shoot that should have been noticed DURING the shoot. More than likely, you won't be able to shoot the same thing again.
It's funny you mention the license plate! I actually moved him so it would be viewable. I kind of wanted to state the location in the photo.
2) Your sepia tone works in this image. I'd like to see it in color. Her look to him is great. I normally don't like either of the couple staring into the distance, but there is something about this image that make it work [for him]. Next shoot, make sure to also watch where you're cropping. As a couple, they wouldn't notice part of his hair cut off. It's minor and like I said, they probably won't notice it, but as a photographer, watch your crops
The hair cut-off can luckily be salvaged. I didn't notice it when I cropped, but the original image is actually much wider, so I can fix this.
3) Good composition again. Lovely look in her. I don't like him staring out though. Would have worked better if he was looking either at her or at the camera. Could have used a good DOF like you did with #1....f/8-11...just to where he wasn't that blurry, but is still seen.
So, more blurry? If so, I'd need an aperture as large as possible, methinks. f/2.8, or pull out my 50mm/1.4, and shoot even larger.
4) I like her look. She seems to be most comfortable. If he likes how he is [smiling?] then this would be a GREAT engagement photo for the newspaper. Otherwise, I'm not to fond of his "look." That eyebrow action really gets me. If that's how he looks, then that's how he looks and there's nothing you can do about it.
I'll have to ask the client. I'm not sure if they like his expression or not.
I hope this helps better your work and find the positive in it too
~Michael~