Not sure how helpful this will be, but this is how I separated the nose! Skin layer shaped as the nose, and the lines clipped into it.
The nose layers should be above the eyes to cover them when the head rotates :3
โจAdvanced Vtuber Model Rig Tips :
How to make sphere perspective with warp deformers (Eyeball movement as an example)
โจThis method can be used wherever a sphere perspective is required.
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