I don’t have a lot of experience, and I not sure how it is with mixes, based on what I see, I guess:
Red- cockerel
Because the lack of leg wash, I can see a peek of pink wattles, and the lighter down color.
Yellow- cockerel
Because the lack of leg wash, I can see a little bit of pink wattles, and the white bars on the feathers are thicker.
I’d say the rest are pullets. You can’t really judge by their combs at that age, my pullet has a comb as big, if not bigger than all of those, and I’m pretty positive she’s a girl.