Nautilus Shell

My drawing on the nautilus shell, a form of biological beauty. Trying to get the shading to reflect spherical depth was the challenge of this drawing.

Conch Shells With Soft Shading

The book had some lessons on using color, but I skipped them for now and jumped ahead to soft shading. I drew this conch shell, which could have more defined shading, but it is the best I can do at this point in time...