I have to say, I'm probably more picky than most when it comes to Asian sims in Sims 3. I've seen very few sims that don't have custom skin or sliders that really look asian. Sims 4 is MUCH better out of the box for making asian sims. On the other hand with Sims 3 people make amazing celeb sims.
Anyhow, here is one of my current asian sims:
https://i.imgur.com/twyYch7.jpg
IMO the hardest part to get right is the eyes, and Kurasoberina's epicanthic skin really goes a long way in fixing that.