The set includes 3 paintings:

Listen to Some Music in Striped Pajamas https://pinakothiki.gr/en/product/listen-to-some-music-in-stripped-pyjamas/ 

After Sun Relax https://pinakothiki.gr/en/product/after-sun-relax/ 

Big Thoughts https://pinakothiki.gr/en/product/big-thoughts/ 

Corona Version 9, materials CoronaLegacyMtl
In CoronaRender 6 and below CoronaLegacyMtl = CoronaMtl
CoronaLegacyMtl requires Corona Renderer version 1.5 or higher, as the maps are designed to use PBR (roughness-metallic)