Males or females- dominicker chickens

[stephbrown]

I am NEW to raising chickens and got some from a local feed store. I am not exactly sure of their age, but I have had them for a week so far. I think they are three or four weeks old? Can anyone please help me determine if they are females? I am afraid I have all roosters but I really can't tell as I have NO experience and from all of the videos I have watched, I am still confused. I truly appreciate any help! Thanks.

 

[The Happster]

I understood with Marans the ones with clear headspots are girls and the one with less clear are lads....not sure if I'm right with that. Could someone confirm? But you'll be able to tell in a couple more weeks anyway.

 

[Silviaschicks]

those only look like 2 week olds