That's a much better photo, and given the size and redness of the comb and wattles (which are much clearer in this photo), it is a cockerel. It's not a pure Australorp either as it has brown feathers in its neck and wings.
Chick 1 is a White Rock pullet, chick 2 is a Production Red cockerel; and I can't see the comb real well on chick 3 either due to bad angles or blurriness in the last pic of it, but what I can see of it, I'm thinking pullet.