Drawing Envy

Saw this a while ago and was immediately jealous of Andrei ( Zoster ) Răducanu. 

Granted, maybe these took him hours to produce and multiple drafting tools, but I doubt it. It looks reasonably effortless. Whenever I try to do the "thick pencil, wavy line, sort-of-constructed" sketch, it ends up looking blocky, squiggly, and too-constructed.