How to Modify a 3D scan into a mask

Process on how I modified a 3D scan of a Rabbit Skull into a wearable mask
3D Model Credit: sketchfab.com/3d-models/rabbi...
Programs used: Blender and Zbrush
The .STL files for the skull mask can be downloaded here:
www.printables.com/model/6317...
Music used:
Song: AXM - Hope
Music provided by Vlog No Copyright Music.
Video Link: • AXM - Hope (Vlog No Co...
Song: Thomas Gresen - Pretty Lies (Vlog No Copyright Music)
Music provided by Vlog No Copyright Music.
Video Link: • Thomas Gresen - Pretty...