First and Foremost
When writing any ethnicity or nationality, love and respect the character as a Full and Complete HUMAN; and do your damn research, plenty of it.
Locales, history, clothing, social structures, what and how they might speak, what concerns they may have (emotional, philosophical, peer pressure, etc.) and more....
Imagine / Extend
Imagine the senses of your characters, feel what they feel, think like they think, breathe them to life and imagine and extend and project what choices they might or will make under certain circumstances, whether advantages or hindrances.