A small asthetic change (that notably takes time due to artwork) would be to personalize the major notifications that feature their own artwork and tailor them to the faction being played. An example of this would be when i play as the Riftborn and some sort of truce or peace or agreement is made, a notification will appear featuring artwork (that is really cool already) but the artwork is static. As in it depicts random factions symbolizing the major action that just took place in the game. If the major notification artwork was tailored to and depicted the factions involved with the action; it would serve to further personalize the player's story that he/she creates over hundreds of turns. Creating gameplay that is just that much more immersive.