Perhaps further information could come from the chevrons on his sleeves. Again, I'm no expert, but the internet says that the single chevron on his right upper arm denotes him as lance corporal. The double chevron on his lower left sleeve seem to have been awarded for years of service with good conduct. I'm unclear how many years would be denoted by two chevrons, but it would at least point to him having served for a while when this was painted (which of course would make sense with his campaign insignia).