For gum trees it is good to be able to see the fruits (gum nuts) which are sometimes obvious on the ground under the tree. If there are young plants near the mature one a look at their juvenile leaves, often very different from the adult leaves, can also be helpful. But bark is good too, and I was able to get this one just on the bark and the location on a creek. Can't guarantee I can always do it though! Looking up into the crown the way you have is good, as it shows whether there is rough bark all the way up or only at the base of the trunk, as in this case.
Having read Volker Framenau and Cor Vink's 2001 revision of the genus Venatrix (Invertebrate Taxonomy 15, 927-970) and viewed images of the species on Framenau's Flickr pages, I'm confident of the ID of the spider in this sighting.
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