Hi Steve,
Well done mate. That's a very handsome bust, full of character. I don't mean to nit pick, but there are a couple of tiny little things you might want to look at.
The brass "Australia" flash on the epaulette is shaped like a smile, as seen in the attached pic.
Jason has already pointed out that the pugaree around the slouch hat is the wrong type and colour, and the emu feathers are sandy colored.
Having said that, I think you've done a good job.
Cheers