A sign that a character is absolutely terrified is if the eyes are wide open and the irises and pupils are shrunken to minimum, or even absent. Gives the impression that the character is screaming inside, even if they are silent with shock. It comes across as striking and, if done well, can even be Nightmare Fuel or its high octane equivalent. Often a warning sign that the character is about to Freak-Out. May also involve Tears of Fear. Can also happen if a character is injured. It's a good way of illustrating shock. Bonus points if the scene cuts away to a Scream Discretion Shot. Examples: