Very good.
The lighting is much better than the first, quite even and soft; so much better, they are hard to compare.
Since I have not attempted this, I can only take a stab at offering a suggestion. I have both images up, side by side, and one thing that stands out as a common issue (minor, but still there) is the relatively hot spots, particularly on her right breast. Like I said, I don't know your exposure proceedure; but since the desired effect is very low tone, I would expose for the brightest spot (breast in these images) and then underexpose until I had them light, but not a pure white -- probably a full stop to stop and a half down.
The idea I am pursuing is to provide the brightest spot with enough light to be well exposed. Then, I would let the shadows fall where they may. :) Of course you may need to adjust the lighting to get the range of tones desired without having the relative hot spots so much hotter than the rest. Just use all you have shown you know about evening out the light, and stop it down for effect.
David
Just taking a stab in the dark.
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