Firstly I am no expert and am still learning and can appreciate how hard it can be to get a decent potrait shot. But for what it is worth I’m happy to add some comments – just my inexpert opinion though.
I have to agree with the above – the first does look a little soft and overexposed in parts (the face etc) – it could probably do with some sharpening. Also I am not sure that the background is the great, having something less distracting than the heavy folliage ansd the house might have framed the couple better.
The second is better, but the whites look a little blown. Again should be easy to fix in photoshop.
The third is probably the best – but Skittle makes a good point about the background… they are often overlooked when you are focussing on the main subject.