Pen and ink flower. "Pen and ink of a flower is usually heavy on exaggerated values to deepen effect of curves in images. This is most of the time very necessary in the choice of subject." - Carlo de Leon Art Opinions™ LOVE this
The use of a continuous line drawing gives depth to an image and through the use of a pen (which is consistent in thickness) forces the drawer to create form and shadow by concentration of particular areas.
This are beautiful fine pen drawings of different shells. The erratic lines give the sense of surface pattern and texture. These were apparently done 'blind' which would explain the expressive lines, and lack of tonal work.