Totally agree. Even though mine is much younger, you can see the feathers on the 13 week old are rounder. Looks like you can expect some blue eggs in about 11-12 weeks!! Here's a tip: I got my girls to start laying by placing golf balls where I wanted them to lay. Worked within hours...
Those legs look pretty skinny... And the tail stands more erect. I say it's a pullet. Sorry you got stuck with some Roos! I just posted my he or she pics on "Easter egger sexing tips/tricks". Take a peek at some of those pictures that others have shared and the feedback.
This is the one I...