Sadly the Sketchfab model got taken down.

In the next gif you can see how the rig works covering blend shapes, the elastic thing on left arm, legs, spine, and mouth. Here is one with better quality (Artstation limits them to 10mb) and some WIP screenshots.

Used the low-poly version for the renders and tried different looks, I really liked the comic-style one but didn’t work well with other poses.

It has been used in a couple of GTAV mods like this one.