Reproduction Ancient Greek lion (with historically accurate paint) as seen at the Athens Archaeological Museum.

Yeah. Many pigments were hard to access or otherwise very expensive. Tyrian purple, for example, was made by boiling a massive amount of rare snails, which is why deep purples were reserved for only the wealthiest of people. In the 1800s, ground up mummies were a fairly common way to make brown pigment.

Kinda reminds me of painted mesoamerican sculptures

That's a pretty psychedelic color scheme.