I had a pretty big rant on Tumblr regarding how the features of different ethnicity have been maddeningly pushed aside. Much of the fan-art these days depicts characters with different skin colors, yet the same typical white person's face. NOW DON'T GET ME WRONG-- I am aware that drawing for different races can be difficult. (I got into a big argument over this.) However, that should inspire you to practice drawing these characters (or anyone!) in accordance to their ethnicity.
Post-rant, I got a request to draw Piper with all her Cherokee glory, and so here she is. High cheekbones, terracotta skin, a long, thin nose, and heavy, almond eyes. Though I gave her dark hair for the sake of sticking to the culture, it could be said that her hair is lighter.