Hello and welcome,
I presume this has been uploaded by your family: https://uboat.net/allies/merchants/c...son/34223.html
He has a seaman's pouch at the National Archives in Kew held in piece: BT 372/353/27 - https://discovery.nationalarchives.g...ils/r/C8186498
His medal file is also there: BT 395/1/43333 - https://discovery.nationalarchives.g...ils/r/D4340161
the pouch can be hit or miss as regards content but usually there are one or more id photos.
He will also have a CRS 10 - service record - at Kew but this will be more or less what you have on his discharge book.