Uh, hate to tell you this, but those ARE roosters. The hens don't develop that much of a comb until at least five months. I know. I've bred Seramas for quite a while now.
I can see this thread is gotta end up getting deleted REAL FAST.....Sorry Buckgawk, all the pictures you posted are of roos IF they are all 6 weeks old...
Now if picture number three is of a 6 month old bird, it is a hen.