Once I was happy with the overall shape I activated DynaMesh with the following settings (Fig.04):
• Groups: Off
• Polish: Off
• Project: On
• Blur: 2
• Resolution: 256

Fig. 04
Rough Sketching Pass
At this stage it is very important for me to carve the overall shape and feature lines of my bust in stone because later on, it will be more difficult to apply global changes. During the rough sketching pass I only used the ClayBuildup, Smooth and, from time to time, Move brush to get my forms. All the time I had my sketches in front of my desk to help me to stick to those base shapes and notes.
Step by step, I added more and more features. I started with the basic skull and neck, before moving on to the nose and eye sockets, then the ears and hair. Mostly I worked with Symmetry on, except for the hairs (Fig.05).
I also used the V key often to check the silhouette of my model (Fig.06).
At the end of my rough sketching pass I applied DynaMesh again, but this time with the Polish feature (Fig.07).

Fig. 07
Next I started to blur/smooth out some surface areas with the Smooth Stronger brush (Fig.08).

Fig. 08