You should remind me how to take one. I liked having them.

[Meaning, yes, he absolutely wants to take a picture of Maruki in this outfit while he can, but it's not just that.

[They were memories you could hold. Pictures of Subaru and Mikasa are still hung up on the wall in he and Jean's bedroom. He took those photos himself. It matters...]

The ones I've seen have helped me to remember. If we're going to do everything, we should have photos of it for that reason, if nothing else.