The places that should have shadows have contouring (the edges of the face, under your cheek bones, etc) are shaded, and areas that protrude (the middle of the nose, the brow bone, middle of the forehead and chin) are lightened. This is a little more product than I use (about 25% more), but I did that just to show up in the pics. I do a little blending with my fingers, and then apply foundation over this. It then becomes very light and natural appearing.
Have you contoured? What are your tips?