How To Draw With A Flexible Fountain Pen: An Introduction To Line Variation

In this video I explain how artists use line variation to make their drawings more compelling, and give you a few simple exercises that develop the ability to control a flexible fountain pen.
I'm using a Pilot Custom 921FA pen here, filled with Noodler's Black.
The artists mentioned in the video are:
Guercino
Raphael
Giovanni Battista Tiepolo
Hans Baldung Grein
Peter Paul Rubens