I didn't have hard copies of my photos so I simply made collages of 4 and added them to word doc. Let's say one collage has pictures of you and your spouse from your honeymoon, you write a caption underneath saying who is in the photos, where are you, what were you doing etc. Keep the captions short and relevant.
For pictures where there were family, I labelled the pictures as top left picture: and then I wrote the people from left to right (be specific here as if you're explaining things to a child). This saved us from printing a bunch of pictures. And pictures can be from any angle -- make sure you include pictures of people who attended your functions (this is very important). Also make sure that when you're adding pictures from events, your family etc. should be smiling in them. You want to show the officer that your marriage was a success and your family members were happy with it.