The little guy with the round head, owl-like eyes and leaf-like fingers is a male spirit figure.
The circles just in front of Johnny are engraved (not painted), a practice that has been dated back at least 14,000 years. The fish in the this painting depict the skeletal bones, and the group of emus are particularly interesting in that the white ones were painted much earlier than the darker figures on the wall, including the large emu.