Maybe I am a bit weird - I know we all have seen how much better and more detailed ESO's art, design, graphics, are design have become over the years - these guys are doing a fantastic job...
What I just always notice and find is fantastic is how amazing the design of the rocks in a specific area is; I don't know if you ever noticed this but every area has very distinct rock-style to that area (color, surface etc.) that not only looks fantastic but also supports the atmosphere of a specific area extremely well (For example the grey gothic and blue-snowy look in western skyrim).
They also manage the stones to look fantastic without looking too "busy" - for example if you compare ESO western Skyrim to TES V Skyrim... the rocks in TES V look way worse, even with mods imo...often too busy and not dedicated to an atmosphere...
Below a few examples of what i mean: