Update V3: PBR, again
Some time at the beginning of the year the PBR validator appeared to have been adjusted, submissions that previously passed now failed, and so in order to get this pattern to pass again I’ve had to alter the colour palette so that the darkest brown is no longer dark, and to compensate for this lack of contrast I have made it shiny in the roughness map.

Added a custom Roughness texture, this is the least reflective due to the large flat surface on the model
Adjusted the brown colour to be above 90 luminosity

Created P90 | Laughing Stock.