I'm not sure if your newspaper photo can be improved.
Perhaps another fresh photo would help you.
If you search on 'Trove" at the link below, you will find one from another Australian newspaper. This one is quite dark too.
Also someone with access to the Herald newspaper, which your photo is from, could perhaps scan another one for you.
I'm sure there will be an expert along soon to offer some help.
Scroll down at left to 'British Boy Scouts for Australia'
http://nla.gov.au/nla.news-page1798479Sarra