Hairline is the same height above the eyebrows as the eyebrows to the nose, or the nose to the chin

There are three parts to focus on: bangs, sides, and back. Make sure to follow the direction of the part. Short hair has a swirl parting

Longer hair has a more straightforward parting. If there are bangs, the bangs come out in a radial direction

Dont draw hair straight; add volume (curvature). For wavy/curly hair, try to follow the direction of the flow of the hair, so it wont have a messy look