Lighting and Rendering
I created a Renderman Environment Light sphere and assigned a HDRI map as an ambient light setup also serving a reflection environment for the eyes. Instead of using the default occlusion for Shadowing, I chose Color Bleeding which I find the result seems to be much softer for human skin. Next, I did a bit of search onto portrait photography and found one with the lighting that I like and started placing lights to follow the reference image. For the final rendering quality, I set 0.5 for Shading Rate and a high value of 12 to Pixel Samples as there would be camera depth of field in the final render. I have tested all filters and decided Blackman-Harris seemed to work best for my render. Also, remember to turn on Sigma Hiding to have good result on hair rendering. Usually you will be tweaking both the lookdev and lighting at the same time to achieve the look. Renderman does allow you to cache the SSS, Render Radiosity (EnvLight) and shadows separately. Also, you could set the cache mode to Per Job, so that it can reuse the same cache for the entire turntable renders. I had the first frame rendered at 8 minutes and subsequent at 4 minutes reusing the cache done earlier.