The storyline of Flax is an important part of creating a good concept for a story. Although little was known about her or the story beforehand, the concepts helped to develop said story and took it into directions nobody thought of before.
Knowing where to go when you want to become a self-taught artist isn’t easy. Some people choose to base all their knowledge on one artist or one course. I recommend though to look up several artists. Learn to see things in different perspectives, and see what fits you best at that time.