I suggest aiming a angled camera where the players spawn (without spawnpoints) AND/OR be able to set a setting where you set a camera on a block to take pic every X amount.
I think supers should be able to take the snapshots at their leisure, just so that if they didn't feel like taking an updated one, or one at all, it wouldn't be horrible, because we would be used to not having it, and if they DID take a good one, then, hey, we have a preview of the server.