Houdini Vellum Grain / Sand / Dirt Fx Simulation

SirenHead model available for sale here:
https://willfxtzs.gumroad.com/l/SrnHd
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Brief Description below:
This is an old piece of work from 3 years ago that I decided to pick up & revive it with better visual quality.
The Siren Head model was made years go & I decided to put it to some good use with this Houdini Vfx piece.
The simple idea is simply to showcase a slightly more creative & more complex grain fx simulation in Houdini.

1. 3D model mainly sculpted & Zremesh in Zbrush
2. Model then imported to Houdini for semi-procedural UV unwrap, rigged & animated for vfx stage
3. Texture in Substance Painter
4. Material & renders done using Redshift in Houdini
5. Model previews prep & rendered in Marmoset