Decorative ceramic panel. The reference was the work of the artist Fenella Elms.
https://www.fenellaelms.com/wall-mounted 

Modeling for smoothing: the Turbosmooth modifier is present on the panel - it is open, adjust the degree of smoothing at your discretion. In the preview and in the scene, Turbosmooth iteration = 1.

Designed for close angles.

The renderers are made in Corona Render 9. Corona Legacy Mtl.
"For Corona Render: it is recommended to install a version not lower than 1.5, since the glossiness of the materials is configured with PBR in mind."