The Lanyard on one shoulder is a clue to specialism or trade of a soldier.
I suggest that you post the second photo on the WW1 section of the Forum, and ask them to tell you what the Lanyard means?
Then there is the leather bandolier, probably for ammunition bullets, I guess.
Then the Cap badge, which I think has eight points to the star, by the looks of it.
You could try a goo*** search on military Cap badges, see if you can maqke a match.
The only word of caution that I would add is that sometimes photographers would have an assortment of accessories that they could lend to men wanting to enhance the photos. All may NOT be what it seems, sorry to say.
When my dad was in Edinburgh in 1940, He got a photo taken of himself in a traditional Scots soldier uniform.