Anime characters' faces are ugly because of the shadows, what should I do?

Marcky

The problem with anime characters. Because of the shadows from the lighting, their faces look very scary. It turns out that the nose, lips, and eyebrows cast shadows when the lighting falls and they look like a damn doll. Is there a way to disable shadows for the glb model, or a shader that would prevent this!

Sorry, I do not know which category to put for this question.

bitshift-r

Without seeing your model it's hard to suggest a solution, but for disabling shadows there are a few options that come to mind:

On your model's object properties, under GeometryInstance3D/Geometry, disable Cast Shadow. This will prevent self shadowing from the nose, lips, eyebrows, hair, etc. However, your character will not cast shadows in the environment either.

Disable lighting in your shader. This will make it so no shadows fall on your object, but it can still cast shadows.
If you're using a StandardMaterial3D just set Shading/Shading Mode to Unshaded. Or if you're writing your own shader just set the render_mode to unshaded.

shader_type spatial;
render_mode unshaded;

void vertex() {
    // ...
}

Don't disable shadows, just make then softer. Soft shadows may prevent the harshness and still let your model react to light in a more natural way. In your light's properties increase the value of Light3D/Shadow/Blur.

Hopefully one of these suggestions will help you out.