Easy mode versus normal mode and bonus photos

I've played through FFI once in easy mode and I've started a second game in normal mode using the save data from the first run-through. I have all the bestiary and items and half of the photo album. I have a couple of questions:

1) Is there an advantage to playing in normal mode?

2) I've heard that you can unlock the photo album by playing the game through twice in opposite modes. Is that true?

3) I hit every chest and monster type in the first run through. Do I have to hit every chest and monster again the second time to unlock every picture?

4) Are the remaining photos unlocked all at once at the end, or one at a time?

Thanks.

There are only two things I can help you with. First, normal mode is either the original NES difficulty, or the original WSC difficulty. I'm not sure which one. Easy mode is, as it implies, much easier than normal mode.

To get everything, you need to do everything in both easy mode and normal mode once. I wish I could tell you more, but I don't know any more than this because I haven't touched my FF1 yet.