I did this for a job, as well:
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But can I tell you a secret?
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I didn't realllly mean to plagiarize him so badly. My drawing was for a field guide. It feels good to come clean. Brian Bolland is arguably the best line-drawer in the Batman world, and inarguably one of my favorite comic book artists ever. And seriously, if you've never read The Killing Joke, prioritize; it's the origin story for the Joker.