Important areas for shading are the eye sockets, the temples, the side of the nose and below the cheekbones. The vertical frown wrinkle and the naso-labial ('nose-lip') fold are also important areas to shadow.
The parts of the face that have not been shaded now seem to have been brought forward.
If the non-shaded parts are lightened, this will enhance the effect of bringing those areas "forward". Apply white make-up to the higher parts of the forehead, above the temple, next to the frown wrinkles on the wings of the nose and on top of the nose.
Then you lighten the cheekbones and the outer parts of the naso-labial fold.
The eyebag is also lightened a little.
Between the higher parts of the brow some subtle shadowing is done to generate more depth.
