I meant this.
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The shift in the skin tone is too noticeable: it goes from pale directly to tanned for no apparent reason. I don't know what is producing that effect, though. Maybe it's related to the fact that the render itself needs to be cooked for longer? I don't know for certain.
If I were in your shoes, I'd start by setting 'Rendering quality Enable' to Off. It's better if you keep things simple in the beginning. Just control the quality of your renders by setting a limit time in seconds and a figure for the 'Max Samples' parameter. To reduce noise overall, it's OK to enable the Post denoiser under the Filtering Render settings sub-tab. Setting the 'Post Denoiser Start Iteration' to the same value you give to the 'Max samples' parameter is a good starting point.