You've all been such a great help. In actual life I'm pretty sure that the photograph has aged a little bit due to cigarette smoke, but not too much.
So I think that, using all of your information, it's probably from the early 1890s. This helps a little bit. Surprisingly, here aren't many women in my ancestry, there's only one family I can find that has enough female members to make up the photograph, and they certainly match the date of early 1890s. I can only guess, but it looks to me like 3 generations of women from the same family... it's just a shame there are no names on it!