2 females of US Red-breasted Chinese painted quail, developing a male colouration

Have a closer look at the two birds pictured below.
They were two US Red-breasted females from my strain of “black-headed” birds.
I mean pale US Red-breasted birds having with a particularly dark head.
I wrote they “were” because after their male died, one starter to get other colours.
A few weeks after, the second female began the same modification…
On the pictures take I toke on February 11th, 2021 we clearly notice that one of the two birds is more advanced in his “transformation”.
I will keep this post updated in a few months.