When it comes to artistic styles, here is the law: artistic styles cannot be copyrighted, and as a matter of fact, basically all artists were influenced by artistic styles from one or multiple artists. What we now know as the Japanese manga style started off by importing many of the looks from Disney style, and later developed into their own very recognizable style. Later on, Disney itself, and both Marvel and DC comics then imported manga style into their own art, and the cycle keeps rolling. It doesn't matter who grabs a brush or a stylus - artistic styles cannot be owned by anyone. That's the law. 

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