The chicks should not look too different than yours, mine was fathered by an ameraucana and looked exactly like your boy with the exception that he had a peacomb.
That chick is going to looks so gorgeous when it grows up!
I had a AmeraucanaXBarred Rock roo until 3 days ago(darn coyotes). He had the Perfect barring(better then most or my BRs ever had) a peacomb and a beard. If he didn't have had those yellow legs and beak he would have passed as an...