Charcoal sanding workshop

I have been attending Annie Murphy Robinson's Charcoal Sanding Zoom workshop since last week. Today was the second session. Last week, I couldn't quite understand what this technique was all about although initially I was drawn to the beauty of her drawing and wanted to learn her process. Today, the minute I started sanding the surface I had previously rendered I realized how it worked. The value range and subtle tonal nuance you can create with this technique are quite remarkable. I just started shading for the first time today, but I can kind of previsualize where this drawing is going and what it might look like. I am getting excited!