I tend to draw a lot of Japanese people because, well, I'm Japanese. Regardless of race, though, I like drawing interesting faces. On my bucket list to draw is an interesting face with a gap between the two front teeth. I always thought those faces were interesting, even when I wasn't thinking of drawing them. There must be some personality trait that goes with people who have a gap between their front teeth because the ones I've met have all had strong personalities. Not obnoxious, but confident. At ease in their own skin.