Helpless

 A method of restraint that immobilises simply and effectively

simultaneously making the captive vulnerable at the rear

forcing him into an undignified posture that gnaws at his pride.

The head-strap gag enclosing and restricting his jaw 

is another powerful affirmation of his captor's control.

It's odd, I suppose, to call this great art, but to me the simplicity of the subject and the uncomplicated setting in a picture that could otherwise be taken as to be photograph at first sight implies a great deal of  technical and design skill.

I don't know who the artist is.

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