PICEA KOREANA is an excellent choice for bonsai. Not the most obvious, but firs have a rare beauty that can result in a very attractive bonsai. Its fine needles create a very delicate image. Dominique Bosch guides you step by step. https://bonsaitoday.com/articles/basics/step-by-step/the-graceful-fir-picea-abies-dominique-bosch/