I tend to take photos of couples from behind especially if they're walking hand in hand. I do this mostly because I think it shows their bond and/or connection when they are in most cases unaware of the camera or that I'm taking their photo. Take this one for example.
At that moment, after clicking the shutter I decided to hold the camera to my eye a little longer. I asked myself "what is the reason for this shot" and "what can I do to make it more interesting". And I'm glad I did!
Turns out in this case I didn't physically have to do anything to make this a better photo. I just waited. I had no idea that Hoyu and Annie were going to spontaneously turn around and wave to the crowd behind them. I really love the way it turned out!
So I think, in my humble opinion :), sometimes shooting just to shoot just doesn't cut it. Think about what you want your photo to portray, wait for the moment to unfold, aim, then....FIRE!!