Important yes, needed….probably not. For realistic models definitely but stylized….great reference and i feel makes it easier but all artist are different. I can tell you I am just now getting into anatomy and it’s helped me create a more realistic character.
I started with a human anatomy course on udemy for $10 but you could find YouTube videos or references online. Take 5-10 minute in the morning then at night just looking at the facial bone structure then the muscles and move to another part of the body when you feel comfortable or have done a few studies. It takes time but is totally worth it.
