the brown of Silla is much easier to see, i like the green of Baekje, it works better with the colours of Silla and Goguryea.
i think it would be better if Tang stood out more in the shared areas. it does look better, just not as good an improvement as the other colours.
in an earlier post you said
this is Three Kingdoms of Korea, or Korea 57-668AD but it's not just Korea.
i know CC has recently chnged the name in the database to 3 kingdoms but i was wondering if you have considered at any point putting those years on your map. i know it is a historical map and what period in time because you told me so but Korea (and Korean history) is not well known and so i think most people here would not immediately recognise it for what it is like we might a map such as American Civil War or 13 Colonies.
i say this because when i first saw this map i thought wow, Korea is map up of 3 kingdoms. i still don't know if Korea is currently made up of 3 kingdoms (much like Australia has 6 states and the USA has 50 states) or if that is a thing of the past.