Dans l'absolu, je pense que c'est la bonne chose à faire !
En creusant un tout petit peu, je trouvé
ce vieux post sur un blog qui mentionne
museums.ncl.ac.uk/flint/archrit.html comme origine de l'image. Bien sûr, la page n'existe plus, mais la wayback machine permet d'accéder à une ancienne version, où l'image apparaît effectivement :
https://web.archive.org/web/20090223153 ... chrit.html 
Citer:
Burial and mysticism in prehistoryThe thousands of years that separate us from the Stone Age hunters mean that we can know very little about their beliefs and lives beyond their day to day quest for food and shelter. However, all contemporary societies have rich and complex systems of beliefs and these often find expression in rituals involving dance and various forms of ceremony. Many societies also mark the major stages in an individual's life, such as birth, marriage and death, in a similar fashion. The passage of the seasons and the success of the hunt can also be regarded as having mystical significance. We have no reason to suspect that the Stone Age hunters were any different and archaeology can provide a few examples of what we may consider to be ritual or ceremonial behaviour.
L'image est petite donc il ne pourrait pas s'agir de son *origine*, mais il s'agit en tout cas d'une utilisation ancienne de l'image non retouchée sur un site fiable : celui du
Museum of Antiquities de l'université de Newcastle.

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Sage à ses heures, idiot le reste du temps.
Horaire inconnu.