So we can approximate a date:

There were 2 Hannah Barnwells, 1 born 1871, the other in 1875, both in South Shields.

Assuming the Ladies are around 20 years old, give or take?

So the photo dates around 1890-1895, or thereabouts.

So who's first to check out the 1891 Census???

Oh, and 1 of them married in Dec 1898....