Download this QSpatial dataset: https://qldspatial.information.qld.gov.au/catalogue/custom/detail.page?fid={06795BB9-178E-4A87-B1EF-D2B57C513976}
'Wooded extent and foliage projective cover - Queensland 2013'
It's a large georeferenced file, ~1GB, DP_QLD_FPC2013_WOODED_VEG.tif
Simply drag and drop it into QGIS as your bottom layer, and set opacity to about 50%.