Some spare time and creativity can get you a far. What this guy did – took a huge paper and than first made a sketch of a drawing and then ‘colored’ it just with a single pencil. Well, what can I say more than ‘great talent‘ and ‘a lot of nerve’… Knowing myself, I would’ve probably done only the sketch and after a couple of days started coloring and after a while left it unfinished, and finally tossed it into trash.