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Andrew, So very often the look on the model's face makes the entire image!  Here her look says " Let's explore the darkness together.  What do you think we will find?"  Very nicely done.

Jerry

This one just glows!  I especially like the placement of the model in the corner making great use of the negative space.  I doubt it would be as vibrant if she had been in the center.

I certainly prefer this to the one on the couch,

very nice indeed.

This is a good photograph. You should have cloned (retouched) two those white dots on the black - one is just opposite her toes another - is opposite her knee. 

Ruslan,

You are correct.