What I learned only after 12 hours of drawing cylinders
Don't think about completing rough sketch. The moment you think it, it becomes a chore. It's easy to teach how to draw. But the important thing is to realize it by yourself. People who are used to being taught become incapable of doing the same thing on their own. notice To have an eye, you need time to thoroughly face the object. "It doesn't make sense to fix just one part of the shape. When you think something is wrong, the whole thing is usually different somewhere. You have to correct all the different places a little bit at a time. That is the basic principle.
Even the places that you think are not strange are distorted a little bit, so you have to work on the whole thing.
I didn't think I needed to make any more changes anywhere, but when I went away and looked closely for 10 minutes, it wasn't done at all.
---
This page is auto-translated from /nishio/12時間円柱を描きつづけてはじめてわかったこと using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.