Hi Hickelmeyer,
I turned the photo of the girl the right way up, and enhanced it a bit so we can see it better to try to get a date for you. Hope you don't mind

Do you have the originals of these photos, and if so, can you show us the whole print including any card that they're stuck to, as well as the backs?
For the outdoor group photo, I'm thinking 1860s, perhaps early 1870s, for a date - this is judging by what the lady is wearing.
The photo of the girl seems to have been taken around 1890.
I know you will get plenty more interest and opinion on these

Cheers
Prue