On the note of changing up unit aesthetics, the main units that I would like to see aesthetic reworks done for are the Battanians. I do like their armor, but I feel like it's a little bit out of place.
Since Battania is a Celtic style faction, I would personally like to see something more like this:
or:
Both are very distinctly Celtic, and both feel more fitting in comparison to the other faction armor. Generally, just far less leather on the Battanians.