If picture 3 is on stiff card then it's a cabinet card rather than a postcard so I doubt later than WW1 & probably at the earlier end.
Picture 2 shows a young woman with a modern short hairstyle worn by fashionable women in the 90's.The heavily embroidered bodice in the Oriental style indicates a quite expensive garment unless she was a dressmaker & made it herself.
Women all over the Empire wore the latest fashions within a few months of introduction thanks to fashion periodicals which were much sought after by all classes of women,even those on the lower social scale could at least alter a dress to look modern.
Having a photo taken was considered an occasion & Sunday best would have been worn & would have been that which was in fashion at the time.
Outfits at this time were made rather than bought,although "store bought" dresses were emerging as an alternative this was more a 20th.C trend as was one piece outfits.
A woman of substance would use one of the upmarket dressmakers/milliners & shown the latest fashions & materials,a woman of the mainly middle classes would use local dressmakers & take along a picture of what she wanted,a woman of the lower classes would make her own from pattern books or alter what she had.
In my view picture 2 looks completely different from the other 2, eyes, mouth & chin aren't the same.
jim
