RootsChat.Com

If it helps what you have are 2 photo enlargements that
have been over-sketched due to loss of definition.
It looks like 1890's going by the woman's dress style.
I would suggest they are in their 40's.

Here is his card
Firstly his service number 1101 gives an estimated attestation
of around Jan. 1913. ( no. 1181 attested late Feb. 1913).
There appears to be a date 27/8/14 but unfortunately their diary starts Jan. 1915
on Ancestry.
although they were in France on the 11/8/14 so I need to check that out.
Added:
On the 27th. Aug. 1914 the diary states that 1/GH were "engaging with the enemy
while endeavouring to fall back to re-join their Brigade"
This was at Clary France.
There is no list of casualties (which would have included missing men).
The Bde. diary gives a slightly different picture.
On the 26th. part of 1/GH which included B Coy. which your man was in were ordered to cover the retreat of the Bde. & eventually sent orders to retire but in the confusion they remained in place & were subsequently reported as missing.
This was at Audencourt.
I would suggest this was the day he was taken prisoner but not formally recorded until the day after.

The rounded corners really only confirm the date
the giveaway is the long bodice & (on the 2nd.)
the tight fitting lower sleeve so probable closer
to late 1870's than mid.

Do you know their dates of birth.
Pic. 1 looks 1920's.
Pic. 2 looks 1950's.