1- I'm not really digging the "fairy tale" look of the picture. I find the couple is also a bit too centered in the image, even if they are off center.
2- I'm not liking the selective colouring. And the colour that has been kept looks a bit too radioactive and totally fake.
The one of them walking down the isle has an odd angle to it, and its too zoomed out. There is alot going on in the image and zooming in would probably help isolate your main subjects
The last one is creative, but I don't like the choice of the foreground image - ie the empty church. It gives a whole ghost / creepy feel to the image.