Color on Narrow Faces:
The key for women with narrow faces is to apply color close to the nose, keeping away from the perimeter of the face. This keeps the perimeter of the face brighter and makes it look a little wider. Also, darkening a little right under the chin will help provide a stronger end to the face, making it look shorter.
Color on Round Faces:
Women who have round faces should apply color farther away from the nose, toward the perimeter of the face. This provides a shadowing effect, making the face seem thinner.
There is no best product to use. There are no magic fix-alls. What is best is what works best for each woman. If someone has an old eyelash curler that she has had for 10 years and it works perfectly well for her, there is no reason to change it. Beauty is individual; therefore each woman has to discover what ultimately works best for her.
It All Adds Up:
The most important thing to remember with good makeup is that everything should be small and subtle. No one part of the makeup routine should dominate the face. Applying makeup should be done sparingly so that each part (eyes, cheeks, lips, etc) can work together harmoniously to bring out a face's best feature.