Need help sexing a few chickens in my flock?

[sierraxcherry]

I have a few 12 week old or so chickens and want to know what gender you guys think they are. Also the polish is only about 6 weeks old I believe. Any opinions help thanks also sorry for the bad quality on some of the pics, my chicksn

 

[The Happster]

I'm not good with polish, but the other birds are boys.

 

[sierraxcherry]

I'm not good with polish, but the other birds are boys.

Had a feeling they were :/
Thank you!

 

[LadyAchee]

I'd say polish is a pullet and the other 2 seem to be cockerels.