Inverse Square Law with a Subject

My model Abby :) thanks for the help Abby and Quintin for holding the lights!

1 ft. from the light, which was held by
Quintin.
White Balance: Tungsten Light
Shutter Speed 1/60 sec.
Aperture f/3.5
ISO 400
Focal Length 18 mm
Manual Settings

2 ft. from the light.
Shutter Speed 1/6 sec.
Aperture f/3.5
ISO 400
18 mm

4 ft. from the light
Shutter Speed 1/20 sec.
f/3.5
ISO 400
18 mm

8 ft. from the light.
1/15 sec.
f/3.5
ISO 400
18 mm

16 ft.
1/8 sec.
f/3.5
ISO 400
18 mm