Very nice. Nice POV.

Very artistic. She has lovely hands.

if you wanted to add some contrast to lead a viewer's eyes up towards the cuffs, try a lighter shade of panties next time. something like pink would contrast well i think. pink is usually seen as a defenseless color and that would counterpoint the black cuffs nicely. besides, pink would also provide enough tonal difference to the subject's skin color where it wouldn't be completely lost or washed out. still, well done.

Dang, I would love to get a grip on that!