The underneath and dorsal shots of he head are out of focusand too crumpled to be of any use. I can't even locate the eye scales. The third pic of the body scales allows a scale count = 13. That and the fact that the skin was in a well elevated position and the presumed location is Brisbane, in addition to a relatively thin body width to length (even allowing for stretching out of a cast slough)... all say Common Tree Snake (Dendrelaphis punctulatus).
Blue