I am not an expert by any means but those 2 are roos. In the first pic the 2 you see the heads on are cockerels/roosters and the 2 that you can only see the tails on look to be pullets/hens to me. Hope this helps & maybe others will have a different opinion.
Thanks guys, I thought so too, out of 6 chickens we got, LoL 3 have turned out to be Roo's, and the other 3 pullets.. Love them all, but dont think I can keep 3 Roosters! They just all have such great personalities!