Your male definitely had red on it long before mine. Mine looked more like that one in the middle of your picture standing up tall. I heard there was a way to tell by the tail feathers but to me all of my chickens look like they have fuzzy lumps instead of tails. I have maybe two that have...
I bought 2 australorps together, both supposedly female. However they are beginning to look very different. I am not sure if one is developing faster/slower or maybe one is actually a rooster. My neighborhood regs do not allow for roos so this could potentially be a problem if he starts crowing...