This image has been around for a while and can be seen on most spanking Tumblrs. It could be an exaggeration, but there's still something about it that makes it endearing.
Staged or not, I am believing the sub's face. Audrey Knight had a sort of reputation for making even a staged spanking feel like the real thing and I think this is a good example of that.
However, butts need not be the only location for a sub's discomfort.
What a predicament!
I've done some 'wooden pony'-play back when I was Topping and I tend to believe these more brutal versions have to be worse than anything I ever inflicted. This young lady seems genuinely uncomfortable.
This electrical version of the old 'rope walk' seems deliciously cruel.
And I would imagine the only thing worse than having your vulva shocked is to have your nipples shocked as well. At least it seems so based on this poor girl's reaction.