I think CG Trader needs to publish guidelines for minimum requirements for PBR. I have suggested this before to Eduardas & it's on the "to do list" apparently. I did just take part in the PBR test - had feedback at round 1, re-submitted addressing issues, mainly colour & normal map details. Failed at round 2 with no feedback as to why. Just advised to keep improving my skills?
Got in touch with support & was told due to high level of submissions failed tests won't receive feedback. All they need is a reason system i.e.: Reason A (inaccurate model dimensions) Reason B (incorrect colour) Reason C (poor topology) etc. Then I know what to improve! It feels like a bit of a closed shop to me.