From what I can see in the animated gif, Posette's legs look like they twist a bit or distort sideways as she walks.
Antonia's does not do that.
Antonia looks more natural as she walks.

The feet also look more natural as Antonia walks than they do on Posette.

Let me introduce you to my multiple personalities. :)
     BluEcho...Faery_Light...Faery_Souls.