I just posted a question about feather growth in males/females of different breeds. Some breeds this the male feathering slower than the female doesn't work, maybe with this breed t doesn't either.
Side views are better, but...
First picture:Left, cockerel- GLW Right, maybe an EE and a pullet. If it is a GLW, which I don't think it is, just a similar color patter, it has a single comb and dark feet which is all wrong for a Wyandotte
Second picture: Partridge Wyandotte cockerel
Third picture: Red Sex Link pullet
Fourth picture: need a side view of the white one, but it looks to be a pullet, maybe a White Rock? The other one is most definitely a GLW cockerel.
Last picture is a Barred Rock cockerel. The white spot on the head is very distinct and he has a lighter coloring that you see in pullets.
Sorry, I hope you can get more girls because you got a few boys in that batch. It is a nice variety, but unless you can keep roos, you should probably either find them new homes or plan to butcher them in about 16 weeks, they are good dual purpose breeds.
Here is a page, scroll down a bit to find a green box with sketches of the different comb types and you can see what the difference is: http://hubpages.com/hub/Taming-Wild-Roosters
Most of the eggs came from a GLW, but the roosters the lady has i got them from range from Marans to EEs to who knows what! lol. I'll try to get side pics on them tomorrow, i really hope not all them are roos, i'm trying to sell them...
on another note: do Polish chicks or Polish Xs get their feathers super fast? I had 3 hatch over the weekend and they actually had little wing feathers when they were born, and now at 5 days old all 3 have almost full wings already... ? I know they are Polish X GLW-Brahma crosses since they came form my hens.