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.
I did this one to practice my pencil work and to improve on drawing realism. I used a reference photo from one of my favorite magazines, Inked, I removed the other tattoos on the model except for the beautiful rose tattoo.