One variation we use commonly is the senior instructor and other instructors lined up along the joseki side and the rest of the students facing the shomen — joseki to shimoseki. Depending on how formal you're being, the students don't particularly have to be in senpai order except that the head of the line leads the bow.
Another variation is the students lined up along the shimoseki facing the senior and other instructors.
Haven't really heard of the picture order outside of photography.
FWIW
Doug Walker
Completely cut off both heads,
Let a single sword stand against the cold sky!