More of a nit-picky thing I suppose, but the metalness for body and head are not flattened textures. I would imagine for the sake of completeness these are supposed to be flattened? The black is also slightly transparent and have a slight anti-aliased edge around the border. Exception of course would be like the eyelashes. May want to double-check the textures provided.
Rigged Avatar - Issues with Textures Provided?