This document summarizes how to build a low-polygon, low-resolution 3D avatar for Happyme using techniques like reusing meshes and textures, limiting polygons and texture sizes, and utilizing tools to streamline the process. Key aspects covered include using 1,000 triangles or less per mesh, 128x128 textures, combining multiple textures onto one, facial expression animation on a frame-by-frame basis, and tools for reviewing, rendering, listing, and naming assets consistently.