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Lol It has happened to me a well and the otherway around too, while in digital forgetting I could just undo something instead of trying to fix it redrawing on top of it xD
Although It reminds me a teacher who always said do not erase while sketching otherwise you won't see what you did wrong...I suppose that has kinda stuck with me hehe

Good advice. I tried not to erase too much and just go with the flow. And i constantly thinks about what could have been done and what should i do to make it better next time.