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Based on the blog and her past work, seems likely the oil painting section is Miyuki Sato.

https://sakugablog.yshi.org/2016/07/11/mob-psycho-100-episode-1/
FierceAlchemist said:
Based on the blog and her past work, seems likely the oil painting section is Miyuki Sato.

https://sakugablog.yshi.org/2016/07/11/mob-psycho-100-episode-1/
She's literally credited for "paint on glass" in the episode, lol.