It’s actually based on a photo I made last year and sent out as an RLSG gift, (Original picture of it here) but amazingly, I was completely unable to find the original copy of either the .ai OR the .psd file for this bad boy, which is kind of a bummer. I actually had to use the low-res version in that picture I posted as the base for the one in the comic.
If anyone has one of the prints of the original, if you could scan it and send me a high-res copy, I’d be eternally grateful. I want to redraw it so I have it for the future, yannow? :D