There is no one right way to apply blush, but there are some general guidelines you can follow to get the best contours for your face. Application of blush depends on the shape of your face.
LONG: Apply blush on the apples and blend out towards the temple.
OVAL: Apply blush on the apples of the cheeks and blend in a circular shape with a blush brush.
ROUND: Apply blush in an angular motion and blend from the apples upward towards the temples.
SQUARE: Apply blush in a linear motion from the sides of your nose toward your ear center.