Most probably these are NOT pre-historic. And, there are THREE boulders with these paintings. To help you I have attached a route map to these paintings from the path to Achyutaraya Temple. The paintings marked 1 on the route map have "SFI" painted in white near it, so easy to find. Just north-east, less than 10 meters away on a slightly lower level is 2 (there are plants very close to the paintings). 3 is on the ledge with a (fantastic) view of Achyutaraya Bazaar.
This site was water logged (in March 2025).
Ganesha is actually sitting on his mother's lap