@Kier_Art It's long and not worth it because at the end you just see inperfections.
I don't have any good tip. It takes a looooot of time but if you really want to do a turn around, watch it turn and correct the mistakes then it will get slowly better.
Some concept arts from "The Twilight World" french/german animated feature project directed by Werner Herzog (Psyop / Sun Creature).
Story: Michael Arias ("Tekkonkinkreet") & Luca Vitale.
Visual development: Linnea Serte & Katsuya Terada.