What is likely date of this photo

[johnmac123]

This is a photo found in the effects of my first cousin 3 times removed John McConville (1836-1919) of Drumgath, County Down. He joined the army as a teenager.
There is no name of who it is written on the back. She doesn't look like his wife but could be one of his two sisters born 1844 & 1847.
Can anyone estimate when this photograph was taken from her clothing and hairstyle?
A google image search gives similar styles from the 1860's.
I have been told that it was taken in Belfast though I don't have the original photo therefore don't know the name of the photographer.
Also a rough estimate of her age?

 

[McGroger]

Not an expert, just along to get the ball rolling. My estimate would also be 1860s, about mid-decade.

Regarding her age, sadly someone has smoothed the subject's face, making it impossible to give a good assessment. I'd just say it's feasible she could be one of your cousin's sisters (if our dating is close enough).

Hopefully a more expert contributor will be along shortly.

Peter

[Viktoria]

Well it is not a full crinoline dress,so mid 1800’s at a rough guess.

I find the hair style confusing ,that roll on her forehead but nothing on the sides?
Viktoria.

[Milliepede]

Is the photo clear enough to see if she has a wedding ring on? 

She looks a young woman around 20 give or take. 

[jim1]

Agree 1860's & as Viktoria has pointed out she's not wearing the full crinoline
which lost favour late decade.
I would suggest 1866-9.
As the 2 sisters are only 3 years apart it's impossible to say which one it is
assuming it's one of them.

[johnmac123]

Thanks for your help everyone. It looks likely that the photo was taken late 1860's which would be a good fit for the age of John's two sisters.