Thought it made her skin pop from the brick a little better.
There might be some better ways to do that.
Procure a lens that renders depth better. These are the high-end professional lenses for the most part and they cost like it.
Have your model pose farther away from the background and set your depth of field to blur the background slightly.
Use flash and underexpose the background and flash your model to the proper exposure.
Use a similar technique in Photoshop to darken the background slightly.
No need to change the color of either your model or the background.