This image uses the rules of halves, half of her face takes up the left side then the other side is blackness, using her hand as a divide. Light will have been coming from the left hand side of this picture, exposing that side of her face.
i love this image! i think for me to recreate this i could project onto a surface and reflect it in different shaped mirrors. I'm not sure it would quite have the same effect but this would look amazing. spoon by Manfred on Fotoblur | Abstract Photography