Let's focus on drawing hair.
Manga style is known for styling up human traits. It is very common to find heroines sharing the same face. However, they have different hair styles and different clothing to tell them apart.
For that reason, it is very important to practice drawing different hair styles (pulled hair, pony tails, braids, pigtails, etc.) to have a wide variety.
Let's begin with a girl with long hair held with a hair tie.