One neat little trick that we learnt to help create a better posture is to ask your bride / groom (whoever is facing you) to take a deep breath and open their shoulders. This automatically makes their posture look a lot healthier and makes them look much more flattering overall.
Secondly, having your couple close their eyes is a sure way to create an intimate photo. With eyes closed, it signifies that they are alone and that nothing around them really matters to them besides each other. It is important, though, to have some connection between the two – and by holding / cuddling each other, you solve that.
Eyes are incredibly important, especially for the connection between your couple and even the viewer. So if you “remove” the eyes from the photo, make sure to find that connection in other means (holding each other for example).