Side point regarding the hand the author draws on whiteboard: it looks off because the finger joint closer to the fingertip cannot bend as much as the joint closer to the knuckle. Some artist taught me this on a YouTube video. It does make me think about how to teach and explain these intuitions you have to really put to words what is different, what looks off etc. and more importantly how to fix them. Coding might be the same case, I think? Maybe LLMs can help here.