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This is a cool idea, nice work. Have you tried putting it to use to see if it improved your drawing?

Yeah, I've been using it for a few months. The progress is slow but consistent. I find the procedural lines are the best practice. My scores are slowly but surely getting better over time. It's still good to do regular drawing practice though because there's more to drawing than abstract lines, but it definitely puts me on the right track to get more accurate instead of always just loosely doodling.