My favorite model, Mila is lit with two Canon 580 exII, triggered remotely, shot with a Canon 16-35mm and a 70-200mm. I metered the camera to expose the sky/clouds, and adjusted the flash power settings to lighten up the foreground. The image was desaturated using Hue/Saturation, while individually desaturating each color channel except for red and a little bit of yellow. A few Curves layers were added to create the mood.

Hover over the flash at the bottom to see the process.