Hey,
So I am having a hard time combining the Paper Head 2d animation with a 3D face mask. Everytime I try and combine the two, the 2d animation from the Paper Head template does not track to the users face when a 3D model is attached to it. 
How can I get the mouth animation from the Paper Head template to track the same way the 3D model tracks the users face?
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Unfortunately, it's likely due to the operating system or hardware you're using – since they don't meet the system requirements for Lens Studio.
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Minimum Requirements
Operating System: Windows 10 (64 bit); MacOS 10.11+
Hardware: Minimum of Intel Core i3 2.5Ghz or AMD Phenom II 2.6Ghz with 4 GB RAM; Intel HD Graphics 4000 / Nvidia GeForce 710 / AMD Radeon HD 6450 or better; screen resolution of 1280x768 or higher
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Happy creating!
I'm not sure if this is what you were asking but the way the paper mouth usually works is through different face expression values. It basically Looks at your mouth and decides how open it is. There are usually 5 levels between not being opened and all the way opened. Each level has a different image for it like being closed opened or halfway opened.
Possible solution
You should Find the paper head controller script and use it to control the mouth by adding different values for how open the mouth is. Hope this helps. If you need classification or images let me know.