Succubus, photo by Harold Davis. View this image larger.

A model can look ravishing, contemplative, or terrifying—depending on how she is posed, lit, and photographed. And on how the photo is post-processed.

In this case, the photo was a pretty typical studio pose with a lovely model dressed in a white camisole on a white background. In the Photoshop Darkroom I inverted the L channel to create the image you see. White has become black, and the overall treatment of the photo verges more on the frightening than the beautiful.