I had the opportunity to break down my piece "Creeping" back in 2019 through an 80 Level article! I thoroughly enjoyed writing about my process and I hope to do it again soon in the future :). Link to the article is below.
https://www.artstation.com/artwork/1nX36K
Full article available here: https://80.lv/articles/002mrs-crafting-a-cel-shaded-game-ready-scene-in-ue4/