Respectful depictions of East Asian historical eras
Keep the word ‘exotic’ out of your world if the characters in-universe wouldn’t find it exotic (e.g. regional accents, food, etc). In fact, I personally wouldn’t use it, since it’s part of othering, which is also something you shouldn’t do.
If the majority of your characters are dark-haired and dark-eyed, for example, there’s no need to comment on someone’s dark hair or eyes when doing descriptions. A great deal of people living in that universe wouldn’t consider the color worth commenting on.
There are other ways to describe people. Use those. (Obviously, there are exceptions to coloring—a good example is the manga Chouka Kou, which takes place in the Tang Dynasty and mentions when a character is blond and blue-eyed, because for them that’s unusual.)
Another example is not describing hanzi or writing as ‘symbols’ or ‘decorations,’ since again, othering. Yes, it looks different, but it’s not there to look pretty or tribal or what-have-you.
Also, read and consume works that take place in the Tang Dynasty to get a feel for what it was like back then, and note how things are written and described, because it’ll usually be done from an insider’s PoV, and that should give you a decent handle on how to go about it.
A bit on description: I feel as if, if the majority of characters are of similar hair and eye color, it only needs to be noted initially as to give us a sense of what the common people, aka the setting’s “Default” look like.
This was so nicely set-up in The Hunger Games (too bad it was ignored!) and I think it’s a good example:
He could be my brother. Straight black hair, olive skin, we even have the same gray eyes. But we’re not related, at least not closely. Most of the families who work the mines resemble one another this way.
That’s why my mother and Prim, with their light hair and blue eyes, always look out of place. They are.
We have that Seam look. Dark straight hair, olive skin, gray eyes.
-The Hunger Games & Catching Fire, Suzanne Collins