I was trying to create a low poly model and the shadows on her hair look pretty bad. They look fine on the rest of the body. I'm sure it's a modeling error on my end, but I'm not really sure what I'm doing wrong.
Here is the blend file: https://drive.google.com/file/d/1iVsAB1jhIeeZM4LSjsm5mwWmVu2pLkuQ/view?usp=sharing
Any advice or help would be appreciated.