Sorry, yes Jed, I know that I have one Wyandotte and two buff brahmas. Sort of through process of elimination I have figured out what all of my other chicks are but these are the remaining three I'm not sure about. I know if I could just be patient I would know in a few weeks but that's just so long and forever taking!
Okay. #1 doesn't look like a buff Brahma to me. Its face, anyway, looks more like a Welsummer or brown Leghorn. #2 could well be a GL Wyandotte. #3 looks like a possible silver laced Wyandotte.
Brahmas always have feathered legs and feet, so that is one way to know whether you have that breed or not.
I agree with @JedJackson that it would help to know if you ordered these chicks and are just trying to id which are which breed or if they were random chicks and you are trying to ID them from scratch. Being able to see the whole chick might help as at the moment all we can really see is their head and your hand. Clean legs or feathered shanks is an important ID characteristic that we cannot see. A close up of the comb of each chick would also be helpful.
Edited to add that I see that you have now added that info re context whilst I was posting.