I made this Stone Age shelter (with grass pop), tested it and it grew out of hand.
PT render, took 2 hours. Very low light at 5ยบ, with a path cut out in the wood to light the scene. Unfortunately it's very dark, even with exposure set to 10 and contrast down to 0.125. Trying to adjust the 32-bit exr got it just very grainy.
Perhaps the leaves should have more translucency (0.2 now, and opacity at 0.7).
First one is straight from TG, second one adjusted from an 8-bit tif, third adjusted from the 32-bit exr.