Suck in cheeks and apply contour/blush powder or cream to the hollows, holding the brush at an angle and sweeping it out towards your hairline.
Relax face and blend in using soft, sweeping strokes back and forth at the same angle.
Use tip of the brush to apply highlighter along the nose or at your temples.
For contouring the nose, pinch bristles for control and sweep along the length of the nose.