How to fix an outline?

I don’t know why but from some angles the outline starts to look really bad
And I don’t know what the reason is



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How to fix it?

That’s just a downside of using the solidify method. I’d recommend using grease pencil line art instead

I don’t know why but my grease pencil is not showing up

I understand that the modifier requires a camera to work.
As a result, the contour turned out to be uneven and there are defects in some places.