Gender help with 4 2-month-old mixed breed chicks

[QChickieMama]

There are 4 chicks: very dark with brown bits (astrolorp and RIR mix), all medium brown color, mostly brown & some white, and mostly white & some brown. I'm sending all the shots I took in case parts can be seen in different photos. The ones that have huge yellow feet: roosters?

I'll call them Black, Brown, Brown/white, White/brown. They're probably all part RIR, if that helps.

 

[Dovethesilkie]

All brown looks like a cockerel

 

[LadiesAndJane]

All brown looks like a cockerel

Agreed.

 

[Rhodebar Lover]

I see two boys and two girls, these being the boys:

 

[QChickieMama]

What's the clue on the Brown/white one?

 

[Little Baby Bean]

What's the clue on the Brown/white one?

The comb is very risen and red.