Please help - girl or boy

[Chicken_Lily9]

I have 2 x 10 week old Plymouth rock chickens. I was told both were girls but they are looking very different. I fear one is a rooster but I want to be sure
Pls help!

 

[horror_trashcan]

First one is cockerel second is pullet, I think you can see some saddle feathers in the first picture. Very pretty.

 

[OrpingtonManiac]

I agree, first is a cockerel, second is a pullet