Using an airbrush is a perfect application technique for contouring. By adding a shade of foundation a bit darker than your natural skin tone, you can easily add contour to the hollows of your cheeks by using a sweeping motion from the back of the cheek and working forward. Achieving a contoured jaw is done in a similar manner, starting from the hairline by the ear and moving toward the ear. Start sparingly, adding color if necessary.
Highlighter is used to add a bit of brightness to areas you'd like to perk up or make stand out. A logical place to add highlighter is on the eyelids to "wake them up." Just add a few drops of highlighter to the airbrush tool, then start at the inner eye, working your way outward. The smile lines are another area that can benefit from highlighting.
With these tips, your makeup look will be even more flawless!