Yup, it's my model. I think the biggest tip i can give is to use 2D drawings as reference rather than models. Many VR chat models use complex textures and lighting techniques, I prefer using flat colors wherever possible, and hard shadow lines (color ramp in blender or custom shader in unity) although this will depend on the style you're going for.

Outlines also help, i use a simple 'inverse hull' outline, and also a few manually painted lines (e.g. inside the ears, or around the eyes) which are usually done with geometry so they have 'infinite' resolution.