This is a picture of my great Uncle Demitri. He may have been in the greek Army during the Balkan War or the First World War. It appears that his epaulettes may show his rank. I believe he may have either been in the Cavalry but I am not sure.
so does the shoulders tabs
this look like the 1908 regulation uniform ,
the puttees are not original regulation but probably a cheaper replacement of the leather leggings due to cost
the rifle is a bit of a mystery , it's not the standard Mannlicher or the very ancient and loved Gras