Barre definitely went all out with Supremacy. Yes, it is a little surprising that some of the other leaders don't seem to change a lot when they reach higher affinity levels. The in-game explanation could be that each leader has their own personal style when it comes to how they express their affinities. So perhaps, Elodie just does not believe in being as flamboyant in her affinity appearance. The real world explanation could be that the artists at Firaxis wanted each leader's affinity appearance to be unique. It would be boring if every leader of the same affinity looked exactly the same. Plus, the bigger the art changes they make to the leaders, the more time and effort is required, so making some leaders look the same is a good time and resource saver.