Realistic Portrait Drawing With A Dark Background

Hello everyone!
Here is my recent commission piece.
A realistic drawing of a lady.
After drawing, I noticed that the drawing didn't have much contrast so I had to put a dark background. It's been long I used a dark background.
I'm glad how it came out.
I hope you like it.

It took about 30 hours to complete this piece. Size is 20x24 inches.

Materials:
Fbb paper
General's charcoal
2B graphite pencil
Mono zero eraser
Brushes

Steps below:

Thank you.