This photo was taken in an abandoned factory. I always wanted to combine the mess and industrial atmosphere of the factory with a beautiful woman. Fortunately Marije (the model) agreed to enter a restricted area without permission - the building was (nearly) completely closed off because it's quite a dangerous place. All the glass you see on the ground once was part of the roof!
The shutter speed (1/200 sec) was set to my largest sync speed. Aperture f/6.3 was chosen to underexpose the ambient by a pleasant amount. I didn't exactly meter the ambient, so I don't know by how many stops I underexposed exactly.
Two strobes were used to light our model Marije. The key light is a Speedlite 430EX ball-bungied to some sort of pipe sticking out of the ceiling at camera top right. The side light was another Speedlite 430EX with a purple/pink gel on it to create a theatrical effect, and to link her clothing with the bow. It was set up at bottom camera left on a light stand.
Both strobes were set to manual at around 1/2 power. They were controlled from an on-camera Speedlite 580EX-II that didn't add any light to the photo itself. Using the 580EX-II as the master I was able to keep my exposure fully manually controlled, giving me control and consistency between shots. This manual control makes things a lot easier for me - I find it easier to simply dial a strobe up or down than to fully comprehend what's going on in my camera's mind.