<p>This is a digital image of a watercolour (26.7 x 36.6 cm) by <a href="//commons.wikimedia.org/wiki/William_Westall" title="William Westall">William Westall</a>, 1781-1850. It depicts a cave painting on and is titled, "Chasm Island, native cave painting ". Part of a collection on 
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Westall's drawings. <i>Notes at NLA</i> Reproduced in: Drawings / by William Westall ... London : The Royal Commonwealth Society, 1962, Inscription: Painted by the natives on the rocks in Cavern Island, Gulf of Carpentaria.
<a href="//commons.wikimedia.org/wiki/William_Westall" title="William Westall">William Westall</a>, 1781-1850
1803
The image was found amongst the <a href="//commons.wikimedia.org/wiki/National_Library_of_Australia" title="National Library of Australia">National Library of Australia</a>'s extensive and high quality collection of digital scans. This source was this <a rel="nofollow" class="external text" href="http://nla.gov.au/nla.pic-an4565173">address</a>, where it is displayed with a black bar, displaying the name of the library and a catalogue number (given in the preceding address). No claim of ownership can be inferred from this detail and it was removed from the image. The great age makes it the property of us all. It is public domain.