Imagine you are suddenly embarrassed. What happens to your facial expression and body language? Do you touch your face, scratch your head, or some other thing?
Hmmm.... i dunno i'm usually not concentrating on what i am doing when i get embarrased XD
Usually i look at the ground and when i get a decent amount of embarrasment i blush red enough to see ^^; I also often when i am a embarrased or nervous brush my fringe or hair hanging to the side of my face with my hand....or use my index finger with my fist loosely balled to rub the bottom of my nose ^_^