To light a foreground portrait subject against a setting sun, put a hot shoe flash inside a 36-inch umbrella-style softbox (A), and warmed up its output with a 1/4 Rosco CTO warming gel. assistant suspended the Softbox above the subject using a monopod (B) as a boom. posed the child to block the setting sun. Canon EOS 5D (C) and 17–40mm f/4L EF zoom at its 35mm setting. fired the flash with PocketWizard Plus II, for an overall exposure of 1/180 sec at f/13, ISO 100.
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.