Multiple Eisner Award-winning artist Fábio Moon's most recently released work is the cover to BOOM! Studios' "Adventure Time Marshall Lee Spectacular," a collection of three "Adventure Time" stories from creators including Mariko Tamaki, Audrey Mok and S.M. Vidaurri; all starring Marshall Lee, the gender-swapped version of Marceline the Vampire Queen from the Cartoon Network series' Fionna and Cake universe. Released last week, the "Adventure Time Marshall Lee Spectacular" is also the first release from the new comiXology Originals line of comics released exclusively on the digital distribution platform.

CBR has an exclusive look at Moon's behind-the-scenes process for the cover, which include sketches and a watercolor painting used to craft the final product.

Here's a look at the final cover:

"'Adventure Time' attracts the attention of a really wide range of people, from children to adults, and what first caught my attention were creators I admire talking about the show and wanting to contribute to the comic just because they were fans," Moon said in a press release. "Somehow, I related more with the gender-swapped versions of the characters. It's one of the best ideas of the show. I had just watched an episode that focused on Marshall Lee before doing the cover, so it came fairly quick."

Moon is best known for his work on the creator-owned comic book series "Casanova," written by Matt Fraction, and his multiple collaborations with his twin brother Gabriel Bá including "Two Brothers" and an adaptation of Neil Gaiman's short story "How to Talk to Girls at Parties."

"Adventure Time Marshall Lee Spectacular" is on sale now. The next scheduled releases from the comiXology originals line are "Valiant High" from Valiant Entertainment (Feb. 22), and "Harvey Kurtzman’s Marley’s Ghost" (Oct. 15).