Importance of embarrassment

Here is a great piece of art by Eve. I like how she puts a small background story on most of her work, it really adds a lot to it. In this one a girl of 19 receives a spanking from a boy she had been previously tormenting while her mother holds her still. Notice that the mother employs the original otk position to keep her daughter from escaping the punishment from the boy with the ruler.

In a situation like this the mother could have simply spanked her daughter in private at home over the offense, yet she chose to bring in the boy from next door. This was a good idea for two reasons. First, the boy who was wronged would most certainly gain a sense of satisfaction over seeing his tormentor punished for her misbehavior. If the mother had decided to spank her daughter in privacy the boy would have still harbored resentment after. Second, the added embarrassment of the boy seeing her bared, crying, and begging is sure to make the punishment more memorable for the daughter. After a punishment like that the daughter will be much less likely to misbehave around the boy since he knows she is subject to being spanked. Thinking along those lines it makes a lot of sense for people who regularly interact with a girl to be informed of the method in which she is disciplined beforehand.

A poll over whether or not the girl in the art deserved to be spanked by the boy would likely be pointless. I'm sure most would agree she deserved no less. Instead I will make a poll over the more general issue of the importance of embarrassment or humiliation during punishments. Is spanking just about the stinging pain? Or is pain only a step towards the goal of putting a girl in her place through humiliation? Are punishments involving embarrassment only and no spanking effective?