A simple thing like the bride touching up her make-up can make a good shot. Out of focus foreground to highlight bride in mirror, again with small apature and depth of field. Low lighting can make it challenging but a steady hand can make a difference.

Children usually come out better than adults for Black & White photography. Cheeky bridesmaid caught spying on the bride and groom. Again 3D effect much better than flat image, especially when background in unimportant.