My honest opinion (humble one though!) is to go w/ lighter neutral shades. Almost nude colors. Just a little blush, e/s and a sheer, shimmery lippie... Although, I'm thinking about when I was 14 y.o., and I couldn't wear anything really then... Kids are WAY different than when I was 14, and that was 12 years ago! Maybe someone else will have a better suggestion. Post some pics so we can see what you did though *hint, hint*