Yeah as in with sculpting, you basically need to have a basis of knowing how to illustrate in order to get out whatever is in your imagination and onto the screen. That falls under the Concept Art department and it’s totally a different skillset. Every 3D artist wishes he knew how to illustrate, because it is the core of the arts I would say. And surprise surprise, most 3D artists can’t illustrate or draw, and those that know, usually stick around doing concepts. But those who jump over to 3D are killing it.