do these look like hens or roos?

First time chicken mom. I have 8 currently. One of them started crowing but I don't know which one. I have 2 that I have suspected for a while that could be roos. I'm not sure if they both are, or if I'm wrong about one or both of them. The other 6 don't have large combs at all and aren't nearly as red. What does everyone think? First two picgures are my Bantham, second 2 are my golden laced Wyandotte. (Removed the background and put against just black so their features could be seen better)