1- if your napstablook looks like the "1.png" image, make sure to go to material properties (select the mesh called "outline" before that) and enable backface culling (check "2.png")

2- if your napstablook eyes looks blurry (3.png), make sure to go to shader editor (select the material called "napstablook") and change the texture interpolation to "closest" (4.png)
2.5- also do that with the material called "outline" to make it look 100% black

3- if you have any question just comment it in the site and i'll check

4- model by trashysarzy, give credits when used please (would love to see what y'all make with the model)