I'm going to try to remember Throw Back Thursday. It's fun for me to go back and try to remember what was going on in my mind that made me doodle what I doodled on that day.
For these Grahams Up the Tree drawings I used a Pilot Custom 823 with FA nib. This pen is legendary. It has a very soft nib and a giant vacuum filled tank of ink so you can write and draw for days.