For those of you who still don't use an off camera strobe, here is a good example of how inexpensive equipment can drastically improve your shots.
A on camera flash would have flattened the image out, and brightened up the hallway behind her. By moving the flash off camera, we get good muscle definition, great depth, and darken the doorway to frame the body and provide a good dark backdrop for the smoke.
Shot with a sb-600 in manual mode full power off a 20" umbrella.
1/60 sec at f/16
Used "noise ninja" to remove some of the noise from the high ISO.
2 minutes of post work in photoshop, such as adding a slight "s" curve in the curves adjustment to brighten the whites and darken the blacks.