Zbrush practice yesterday...Sean is right. "Dynamesh is your friend"
Starting with a 3D sphere this rough model of my head took about 4 hours....
A new learning curve and understanding of a new interface....
The top image shows a photo inserted as a map into the model space - from this I can snap the view to side or front and sculpt the clay to match the image
I practiced with 'brush' size - 100 seemed to be pretty good for quick application and subtraction of clay and 25 and below for more detailed work...
So far I've used Clay Build Up, Move and Dam_Standard brushes