Personally I like the idea of a dark skinned human!Twilight. Given that her coat is purple in the show, that wouldn't translate well to a shade of caucasian.
Yellow, White, Pink, and tan...those can all carry over to shades of caucasion.
Though Rainbow Dash being blue typically just tranlates to her outfit...dunno why that is. haha.
I don't really see it in her. I'm not going to call it African American because they are not in America and Africa doesn't exist there. But yeah I picture her white mostly.
Faces can be changed using the tabs. The heart tab has a "automatic/manual" setting that controls the faces. Click it to manual and go to the smily face tab to change eyebrows, winking, mouth...
How do you mean? The second tab (first yellow) controls the arms and hands. You can change anything from position of arms to angle of hands and even the fingers.
Yellow, White, Pink, and tan...those can all carry over to shades of caucasion.
Though Rainbow Dash being blue typically just tranlates to her outfit...dunno why that is. haha.
As for Rainbow's hair...I edited that in Paint.