I'm not sure how I haven't seen Sketchfab before, but now I've found it I'll be using it to present my models. It allows me to show the work I've put into the materials and textures, and how they will look in a game engine, with a detailed 3D previewer.
Here's a preview of my latest game asset that's part of a pack I'm working on for the Unreal Marketplace.
I've also uploaded the Flintlock Pistols I worked on for my game project. These previews should really enhance my portfolio.