The hair never lies flat always remember that.
Here are some example of adorable manga hair.
Start the hairline on the scalp.
(Don't worry with your mistakes, you can adjust and remove it later.)
Next step is to follow the curve of the head. It shourld rise from the scalp to show some thickness.
If you choose to draw wavy or curly hair, it should look smooth. If you choose to draw long hair keep your pencil strokes smooth and stroke it long.
Here's a video tutorial on how to draw male and female hair.
Keep trying and Good Luck !
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