This helps you solve the Strange Statues. The puzzle is solved by counting the feathers on each bird's tail and excluding the upside-down birds. The number of feathers represents how many fingers the statues you want to activate should have (2, 3, 5, & 7).
The painting most likely takes inspiration from the Cueva de las Manos cave art in Argentina. Both depict stenciled hands, crude humanoid figures, concentric circles, and many animals.