After a chat With Frank, I tried a render without the denoiser.
DId a lot of testrenders with different settings, so not sure what I changed
But Uped the MaxSamples to 10000, enabled render quality and set it to 10
Also played a bit with translucency
Real dark this image. Looks like today's modern Hollywood movies. Always dark and without additional light... Well done and good render. But a little more light would not be bad.