I've read that independent comic artists reuse assets a lot in order to speed up the process. Like how they'd make a brush of a character's whole head of hair and just stamp it on and warp it a little to fit the angle they're going for! :D
Or how for backgrounds they'll just find a photo of a place that fits their needs and filters it to make it LOOK like it was drawn. Then just personally draw in any important BG detail themselves.
They use all sorts of little hacks like that. It's super cool! B)