Adventure Time Art Submission: Abbey Road
|(L to R) Marceline, Rocker Jake, Princess Bubblegum, BMO, and Finn|
This was done with a Papermate Flair pen. The Papermate's medium size tip gives bolder lines for the characters and stuff in the foreground and a lighter, Staedtler Mars Graphic art pen with a .03 cm tip is for the smaller details in the background.
For reference, here is the original album cover.
And if you are curious, the episode is on Youtube.