Introducing In Maps & Legends

In Maps & Legends is a digital graphic novel by Niki Smith that's now in its 9th volume.  I haven't read it but the concept looks amazing:

Kaitlin Grayson considers herself just an artist until she gets recruited by a strange man named Bartamus, who shows up at her place in the middle of the night and demands she use her skills to save his dying world. Soon Kait gets caught between two worlds, and if Bartamus’ world falls, Earth is next — along with untold other worlds.