How come some of my friends can't see my pictures on Facebook?

[Mark Stoop]

I'm in the same boat, with photos from my mother's wedding.
I'm guessing these photos are in someone else's album, but you're tagged in them?
The reason some of your friends can't see them is because they're not friends with the person who's album it is.
For example, the photos of my mother's wedding were uploaded by my sister. I'm friends with her, and I'm tagged in the photos (looking awesome in my suit), but my friends can't see the photos, because they aren't friends with my sister. People who are friends with my sister can see the photos, and people who are friends with my sister AND me can see the photos on my page.

Hope this helps!