Sculpting a Mermaid Character with Dynamesh - ZBrush Creature Design: Creating Dynamic Concept Imagery for Film and Games - page 422

Figure 7-52: Use the Move brush to shift the faces up from the top of the head to create the fin shape.
3. We will now add eyeballs to the mesh. Append a Polysphere into the ZTool and place it with Transpose
Move and Scale. Mirror it across the X axis using the SubTool master plug-in ( Figure 7-53 ) .
Figure 7-53: Add spheres for eyes.