The shot of Cassie laying on the bed was made with a Canon flash positioned on a light stand to fire into an umbrella from the photographer's right. Cassie also received some light from a window to the left acting as fill. For the second photo of Cassie she was lit entirely by window light, no supplemental lighting or fill was used at all.
The first shot of Georgette was lit using an Alien Bees B400 flash fired through a Photek Softlighter II (the 60" model) pointed straight at her and fill was provided by a Medialight strobe to the photographer's left for fill. The shot of Georgette in the hot tub was lit solely by the Alien Bees Softlighter combination, but the mirrors reflected light back into the shadow areas providing fill.
The photo of Scarlett was made with a Canon flash mounted on a light stand to the photographer's left and fired into an umbrella. A second flash was bounced off the ceiling to provide some fill to the photographer's right.