Inside the booth
Use stillness as the connecting idea
Make a strip without a sequence of dramatic poses.
A calm session can preserve small natural differences instead of a planned performance.
Set a comfortable position
Choose reliable framing and let the participant hold a relaxed pose. Explain the countdown and number of frames, then leave space for ordinary expression. Avoid asking someone to suppress every blink or movement. The result can show minor changes without making them technical failures.
Keep the whole experience
Review the strip as a sequence and choose whether another attempt is wanted. Do not automatically discard a quieter portrait in favour of exaggerated expressions. A brief caption can record the occasion while leaving the photographs to speak for themselves.