I think you really need to think about what sort of effects you are going to get from FastScatter, and where it is appropriate to use it. Most (90%?) of the light on the figure in your scene is coming from the front, so there is no real need for back-lit sss (FasScatter) - it can only detract from the realism of your scene. Use FastScatter when there is a strong source of light at the back of your figure.

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