Casual engagement shots

A friend recently asked me to take some photos of him and his fiancée for their wedding invitations, etc. I'm pretty pleased with how they came out. But if you were re-shooting or editing these, what would you have done differently? (I know, in the last photo the black hat against the black backdrop is less than ideal, but he insisted on keeping it on. )

IMAGE LINK: http://www.flickr.com …/davidmnelson/6​712490085/

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It may just be me, but 2 is (only slightly) unintentionally humorous because the gent, obscured by blur and donning a black cap and black coat, appears somewhat like a burglar or something more sinister, creeping in the background.

I would have placed the light source on the other side (or re-positioned the girl) for the last image. It's always a pretty good idea to get the best looking light on the female subject. As things were lit here, she's half in shadow.

Since the "gent" didn't even shave for his invitational photo and chose to wear a goofy hat, I vote for #2.
The last one would be OK if you'd give him a shave in Photoshop and blur the girls knuckles.

Haha. Thanks both of you for the feedback!

Is it me or does her skin seem border line blown out? I've done this a few times and it bugs me (on my own photos).
The last one needs a separation light since he insisted on wearing the black hat.

Good feedback. I was trying to get it as bright as possible without actually blowing out the skin tones. Personally I like the look, but it may be too much for other people's taste… Are there any general rules to follow in terms of what is desirable for a portrait in that respect?

Some separation light would have definitely been nice on the last one. Thanks.

In one and three I'd have moved them farther from the background so it is more OOF. Whenever I say to a client let's use this as the background they go and stand right up against it until I move them well away.
#2 doesn't seem appropriate for invitations and #4 needs a rim light as you have said.