Chicks with curled tail feathers usually end up being cockerels, such as your EE chick. A pullet's face will become very red around the time they are about to start laying. Saddle and saddle feathers are long, very pointy, and shiny.
Hackle feathers on my young Orp cockerel.
Hope this helps!
I believe the bird in your picture is an EE pullet. Those tail feathers are not her "big girl" feathers yet. I have a BO who's 10+ weeks and has a puny curled tail and she's definitely a girl. The red face comes around from about 4 months old and on. Red face is a sign of sexual maturity and precedes egg-laying. Some still have several weeks from red face to egg.