These different types of lighting create different gradients and colours of light giving an image more meaning and depth. The way the light is enables the image to be more interesting and direct to what you want for your shoot.
You can achieve this by moving the strobe with the colored light slightly closer to the camera plane allowing more light to spill on the model’s face and body, and, of course, position the model accordingly.
Beyond The Key - Building A Subtle Light Setup Lighting isn't easy, a world-class-perfectly-lit studio portrait happens with a lot of instinct and experience. A strong grasp of lighting comes with experimentation and practice.