Just for practice, I've been sketching various DSO's from images, and
I have found spiral galaxies to be, by far, the most challenging. I
have made five attempts thus far, with very humble results. So Mike,
I now appreciate the work that probably went into your sketch of M51.
The medium with white "chalky/waxy" pencil, is quite different than
pencil and/or charcoal. I wish I had a white lead that is harder and
more smoothly "spreadable" on black paper.
So... just to day, "nice drawing" again, Mike!
Sketchily
Rol