Inside the booth
Start symmetrical, then break the pattern
Make the final frame feel different.
A repeated arrangement can make one small change stand out.
Establish a simple pattern
For a pair, begin at similar heights with comfortable mirrored poses. Repeat or vary that arrangement slightly across the first frames. Plan a final change such as one person looking away. Keep movement optional and avoid making symmetry depend on people forcing an uncomfortable posture.
Check the complete strip
Look at the sequence at its final size. The ending should be visible without a long caption explaining it. If the first frames already differ dramatically, simplify another attempt. This is a composition exercise, not a requirement that every person fit the same body position.