It's risky doing light painting with people because they can't sit perfectly still during a long exposure. That's why you need to minimize the length of the exposure and position your models in such a way that movement will be kept to a bare minimum. I photographed these two Balinese dancers seated with this in mind. In addition, I asked them to hold their breath and not blink. The exposure here was 1.3 seconds, and of course the camera was on a tripod. I used a powerful flashlight to illuminate the girls, and the daylight white balance I used insured that they would be imbued with golden color. I used a 24-104mm lens with an aperture of f/8.