Do you know, I'm not 100 percent certain that this young lady was fully aware that this photo was to be taken until she was actually bound, gagged and helpless.
Perhaps she felt ashamed at the idea of being photographed totally naked, and began to struggle uselessly in her attempts to avoid the humiliation of being pictured nude. The rather apprehensive, disapproving look in her eyes and the way her cute bare feet seem to be ineffectually "waggling" with embarrassed frustration are clues.
If this is the case, then I totally approve. Great pic.