The patch notes of the Knights of the Eternal Throne expansion contained something that piqued my interest:
"Added new engine technology to improve fidelity of facial expressions in conversations and cinematics for all characters across the entire game. This graphical improvement is visible on High Shader setting."When I played through the expansion, I made sure to look out for improved facial expressions and documented them whenever I could. I apologize in advance for the screenshot heaviness of this article.