On this (ongoing!) project I have been responsible for vehicles, weapons, keepers, items and cosmetics. I have built assets, built shaders, made materials, directed outsourcing, integrated outsourced assets, done overarching polish and helped iterate on our cosmetic system. I have also helped out on marketing renders, store renders, skinning and done a bunch of 3D concepting. I have written more specifically what I have done in each screenshot.
A huuuge chunk of the work has been made possible thanks to our talented friends over at Ryzin Art.
https://www.artstation.com/ryzinart
Some of our earlier weapons where also created by the great people over at Dhruva Interactive before we parted ways after them being acquired by Rockstar in 2019.