This style of unit cards is an interesting idea but it needs a lot of rework. The major grief is the colours. Especially the white for the back ground as it is aggressive to the eyes and makes the whole card difficult to read. Greek Ceramic painting followed simple colours coding until the Hellenistic era : black and some kind of red (sorry I could not find better word in english).
This would give the Black Figures :
And the Red Figures :
As you could this colour coding does no make the painting as difficult to read as CA unit cards. So CA artists should really be as much faithful as possible to the style they want to reproduce.
Of course more colours could be use.
Minoan painting :
Roman painting :
One important point would be to be faithful to the colours tone. Darker shade would do far better as it would makes the cards more clear. It is pretty much the reason why NTW cards were better than ETW cards.
Here an example of modern reproductions. Imagine the same cards with this colour code.
Better no ? So if CA choose code colour composed of three colours they should use this shade of black, red and cream. Cream could be the background colour as it is the most neutral colour. Then CA could alternate black or red as primary/secondary colour of the unit painting itself.
About the UI itself don't really understand why there is so much space wasted between the unit's stat, the unit cards and the map. As it is right now the unit cards could get more and so be more clear.
As it has already been told command and ability buttons should be up the cards and not down. And CA should not forget the automatic organization of the cards order by type and enable the player to reorganize it as he wish by including a manual command. ETW UI was an epic fail on this later point.