The Red Star should be sex-linked, so there is a 99% chance that it is female. The other two need to be older in order to tell their sex, but the breeds sound correct.
By the way, in case you didn't know, sex-linked chickens, if bred correctly, are auto-sexing. Basically, the male and female chicks are two different colors.
That actually is not an accurate way of telling them apart. Comb and wattle development at a young age and feathering at an older age are the accurate way if telling them apart. As well as attitude and how they hold themselves. And leg size. As well as other indicators.