Mesh of a skull, as well as a remeshed lower-resolution version. Original mesh by YahooJAPAN via Thingiverse.

Skull:

Low-resolution skull:

The original mesh was released under the Creative Commons Attribution 3.0 Unported (CC BY 3.0) license. The remeshed version is hereby also released under the Creative Commons Attribution 3.0 Unported (CC BY 3.0) license, with appropriate attribution to the original contributor.

You can cite this object in your work using this bibtex snippet:

@misc{skull-mesh,
  title = {{Skull}},
  author = {YahooJAPAN},
  note = {Downloaded modified version from odedstein-meshes \url{github.com/odedstein/meshes/tree/master/objects/skull}, originally from \url{thingiverse.com/thing:182365}. Asset licensed under CC BY 3.0.},
  year = {2019}
}