What's a hair colour that would suit me?

I'm a teacher so I can't go too crazy, i've had a caramel ombré before (last pic, i don't think it was the best choice) and i'm into really dark red but maybe there's a colour that would suit me even better? Currently have my natural hair colour which is really dark brown, almost black. I wear it both wavy and straight. (but prefer to straighten it) Sorry for the goofy pictures lol!