How would you best describe and define these terms for bodybuilding?

[TooPowerful4u]

I was thinkin about this for a few days and i was wonderin how exactly someone would describe these aspects?

Good lines: How would someone decide who does and doesnt have good lines? Is this describing muscle shape?

Full Muscle bellies: What exactly is a full muscle belly? Maybe give me an example of a pro bodypart with full muscle bellies, and one whose arent full, so i can decipher the difference.

Muscle Maturity and Hardness: Correct me if im wrong, but isnt hardness the same as dryness? What else makes a muscle look mature? Vascularity? Seperation?