Determine what color of foundation complements your skin tone. Do this by going to an area with natural light, then testing foundations on your forehead. The shade that matches your forehead best is typically the best overall fit for your face. Peach skin often has pink or red undertones, so avoid foundations in the pink spectrum -- they can make your face look ruddy. A yellow-toned foundation is more naturalistic.
Determine if you have dry, oily or sensitive skin. Apply a piece of clear tape to your forehead, rub it a little, then peel it off. See little skin flakes? You need a moisturizing foundation -- tinted face balms work, but tinted moisturizers are the perfect fit for a natural, barely-there look.
Make your powder blush look more natural by starting apple of your cheek, then blending up and out. This gives it the appearance of a natural flush.
Bring out your cheekbones with a highlighting power and a bronzer -- don't go any darker than two shades past your natural tone. Lightly apply the bronzer to the hollows of your cheeks, then brush the highlighter on along the cheekbone. This gives your face a beautifying definition that doesn't look unnatural.