You should try more sketches with different variable line widths. All of your stuff right now have very thick outlines, when the same information could be conveyed with a thinner outlines.
The difference between your outline, and inner lines are based on how dark they are (ie. outside of hair is dark, inside bangs are lighter).
You could try using the same shade, but differentiate with different line weights (ie. outside of hair uses thicker lines, inside bangs use thinner lines).
Why don't you ever give me this kind of criticism? I could become the next Normal Rockwell with practice and feedback.
And. Yet. Meower. Is. The. Only. Person. Who. Comments. On. My. Shit.