What helps reduce the spotty shadows is to remember that you are rendering form. Try to see the head as one sphere. Find the shadows and see how you can unify them instead of breaking the shadow as you have done.
Samewith the arm. the arm is a cylinder first, flesh second. Nuances or hills and valleys along the form are secondary to the overal form. Does this make any sense to you?
Good luck, this will be a beautuful piece when it is completed.
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