Concept absolutely well rendered, "elegance" came out clear and strong. Sensual, allusive, but absolutely not gross. The black dress is almost melt in the background and it gives a really intriguing effect to the picture.
Only 2 parts a little bit out:
the foot....the curve is a bit unnatural, i guess is the model. V4?
the shoes....the general black melt on black is intriguing, but on the feet it seems she lost the toes.
The light is soft, but not weak, it gives a clear definition to the skin, without creating the tipical "plasic effect" of the 3D model, so great job.