I think the headpiece was finely done. The mask portion seemed a bit off. This is based on photos I saw from the internet and they usually depict her with no nose imprint on the mask.
This leaves a different perspective: is it her mask slowly revealing her face? Or is there no mask at all and the headpiece/shadows are covering her eyes etc.
The bust size seems proportionally correct to the original artwork.
One thing I must highlight is your shading. I just like the strong contrast in the different shadow/shades. It almost feels like each shadow doesn't have the same darkness input to the next. Maybe I'm just too focused on shadows. But the details are strong. I hope this critique was helpful. it will be my first.