Second thing I see from your preview?
How many lights do you have?

I fear too many.
Remove lights or reduce their intensity.

I see at least 2 shadows, both lights are in the left upper corner.
So both shadow settings will al least have to go to a higher value.

 

And in a scene like this??? One single infinite light wth IDL in BB's sphere at 60 to 80% is often more then needed.

She is gonna be very-very white when rendered this way.
Certainly if you add IDL and SSS, and perhaps an env sphere.

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