Balancing the face is only one application of contouring that can help improve the overall appearance. It is also possible to make the nose look thinner with the right application strategy.
Contour along the sides and the natural hollows of the nose to help downplay those area. The highlight is added to the very top of the nose, starting up between the eyes and drawing a line downward to the tip of the nose.
Blend the colors to eliminate makeup lines, and notice that the nose will appear thinner. It also helps draw the eyes to the center of the face.