Ok, with the caveat that I am not a portrait photographer and of course there are guys here with far more expertise on that subject than I, just a few things that stand out.
You have some compositional issues really with all three. There is a lot of space above the couples heads in each, and not really much of interest up there to warrant it.
Both of your landscape orientation shots, the female's arm is cut off almost right at the elbow - which really you want to avoid if at all possible. The background in the color shot is super bright -and washed out in a few places, you might want to see about taking the highlights down a bit if at all possible.
The black and whites, well they aren't really crisp - both are kind of muddy at least to my eye. But I'll leave further comment on that to some of our real pros who work a ton in B&W since it's not really my medium.
Ok, so that's the non-friends and family version. Hopefully some of that helps.