Drop a layered PSD here
Layer names: face / eyewhite / irides / eyelash / eye_close / eyebrow /
mouth_open / mouth_close / nose / ears / neck / topwear / front hair / back hair
Multiple hair layers may use front hair_1, front hair_2, and so on.
Only have one PNG? Use Build Layered 2.5D in EasyVtuber Avatar Studio. It runs See-through locally, then this app creates meshes, missing blink/mouth shapes, and hair physics automatically.