I took on the Graham's Up the Tree project one week before little Izobel, my 4th kid, was born. Looking back I have no idea what I was thinking (I also work full time as a game industry artist) but I'm glad I did.
This one was drawn with a Pilot Custom Heritage 92 piston filler fountain pen. The magic of these smaller #5 Pilot nibs is that they're actually softer than the larger #10 and #15 nibs - but not soft enough to have the side effects sometimes associated with soft nibs. Great pen.