Koopalings in PM-TTYD Stile

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Now you've got anti-aliasing on the eyebrows and hair which is definitely not in style and would not work in-game. To remove the jaggyness here, you will have to work with the actual pixels, not with vectors, as you don't have enough control there (unless you work in Illustrator, for example, where you can set preview rendering to render with zoomed pixels).
You can reference the spriting dictionary section on "jagged lines" for help:

Spoiler

JAGGED LINES- (aka Jaggy) A jagged line is any erratic line in pixelart. They should be avoided.

Basically, a jag happens when one piece of the line is bigger than the others, thus 'breaking' it.


To fix this, you can utilize ANTI-ALIASING (check it for more details).

Jaggies also happen in curves, too. To fix them, you need to exponentially make the lines longer/shorter. Anti-aliasing also can make it look nicer.