Click on each image to see a slightly larger version
So what did I do to the photograph on the right? The most obvious thing is the selective-focus effect. Although it's fairly subtle it is still effective in focusing your eye on the bride and groom. Besides that I applied a slight vignette, brought out the sky a touch, toned down the red dress and gave everything a subtle pop. Oh, and I also took out a leaf from the foreground.
Remember the small details for they are what make a good photograph great.
Thanks for looking!