The purpose of blush is to give a healthy glow and help in creating dimension of contours for the face. Using the light and dark shades properly is the key to creating the dimension.
If you've applied too much blush and it looks a bit too harsh or clown-like, smooth it out by blending away the edges with a neutral or light powder at the edges of the blush. You can also just wipe away the excess by gently dabbing a clean makeup sponge or puff across the area.
Avoid placing the very light shades (off white/yellow) directly over the very dark shades. When they mix together, it can look like a patch of grayish dirt. Keep the very light shade about ¼ inch below the very dark shade.
Using a blush brush, apply blush starting at the top of the cheekbones, near the center of the ear, moving down toward the point on the apples of the cheeks directly under the pupils.
When shading, use a color two to three shades darker than your own skin tone.
To locate the bottom cheekbone hollows, suck in your cheeks. The area that does not have a bone is the hollow.
When applying the darker blush shadow, use the thin part of the brush and begin at the edge of the cheek next to the ear. Use very little of the dark blush shadow color and begin at the edge near the ear and work your way out to where the cheek bone ends. (Not reaching the area under the pupil). If not sure of where the cheekbone ends, it's safer to keep the shading short rather than extending it out too far and having it look like a patch of dirt.
Where does a natural blush come from? Blood vessels, which lie directly under the skin. When we're aroused, embarrassed, excited, or active, these blood vessels enlarge, allowing a greater amount of blood to flow to the skin. The result of this is visible as flushed cheeks.