You are on fire!
Even in the earliest forms you’re capturing a likeness. All of the stuff for Stan Winston’s tribute is identifiable just from the shape. Your approach is fundamentally very sound. The gross mass is accurate before any details. I hope the younger artists on the forum realize how much this makes your detail work that much stronger, your speed possible and proceeding to a finish easier.
This whole thread could be used as the basis for a digital sculpting textbook.
Kudos! Thanks for sharing!