When retopologizing eyes for VTuber 3D models, prioritize clean, low-poly edge loops around the eye socket and eyelids—this ensures smooth deformation for animations like blinking or squinting.
Align edges with natural muscle movement paths: This helps the eyes follow VTuber expression rigs without glitching or stretching. Keep topology light (fewer polygons) for real-time performance, and connect eye loops seamlessly to the face’s overall structure for consistent deformation.
For a practical start, use tools like Blender’s RetopoFlow to trace loops along the eye’s creases, then test with a simple blink rig to fix edges that catch or deform unnaturally.