Wow, 4000 samples wasn’t enough to clean the noise? That’s surprising to me..I’ve never needed that many samples before. Then again I’ve not explored volumetrics too much. Typically the splotchy spots come from the denoising algorithm not having enough samples to work with. But 4000 should be plenty. Hmmm…
Your toy truck looks pretty good but the environment and floor appears to be completely desaturated (white and black). Kinda looks like that photo filter that keeps the focus in color while desaturating everything else. Is that the goal?
Did you do the night time scene?