Study anatomy. Study anatomy. Study anatomy. Best advice you'll ever get to improve your sculpting. The tools in ZB are the easy part. Knowing your anatomy is vital.
@SHINIGAMI Yes, terminology is important. It helps giving and receiving detailed feedback on anatomy in an efficient way. On top of that, 'sternocleidomastoid muscle' sounds super cool in a conversation.
Terminology isn't essential, but it does give artists a common language for critiques. So instead of saying "fix that bumpy bit about half way up" you can say "the inferior border of the nose bone is too wide". If the artist receiving the advice knows anatomy, this is a very clear crit.