B. Keep adding the further gradation with oils and take a look at colors wheel and keep adding shadow for his face as well.
C. To give more and more depth, I use multiply set with detail oil brush, both on his face and his hair as well.
9. A. I use blur blender for some part on his face, so it will look smooth and well blended.
B. Making dot in his left eye with Oils as well as his eyelashes, hair and skin. Other way to give more depth on his feature, try to set the layer in different setting and different opacity too.
10. A. Use detail oil to add the strand hair and use effects-focus-soften to blend with base color.