Once again, here is a progression of one of my drawings:
Here is the sculpture I drew from:
The very loose preliminary sketch:
Adding the first layer of values:
Smudging to create an atmosphere and a midtone for the whole paper:
Adding in more darks with the pencil and pulling out the lights with an eraser:
And, the final drawing:
I shouldn't say it is final, because there were many more areas I wanted to work on further. However, I only had two hours at the museum so the piece was deemed "complete" because of time constraints.