Inside the booth
Use a window reflection as a second portrait plane
Compose a reflection in glass while keeping the reflected face readable.
A window reflection can double a portrait into two visual layers. The effect works best when you decide which face is primary and control the room brightness; otherwise the glass may show mostly the interior or mostly the view outside.
Choose the angle
Stand the subject near a window and move the camera until the reflection enters one side of the frame. Avoid a straight-on position if it places the lens reflection over the face. Keep the subject still while testing.
Balance the layers
Reduce bright room lights that reflect in the glass. Adjust the camera angle and the subject-to-window distance until both the real face and reflected face are visible. A darker interior may strengthen the reflection; a brighter exterior may reveal more of the view.
Check the hierarchy
Take a test strip and ask which face the eye notices first. If the reflection competes too strongly, move it toward the edge or simplify the exterior. Keep the composition intentional across all frames by avoiding small camera shifts.