How would you draw the sky if your only tool was a black line? Outline a few fluffy clouds perhaps? Add some cross hatching at the horizon? Well that's why you're not Rembrandt, buddy.
The vast majority of this picture is vacant air, but Rembrandt has filled it with lines so free and abstract that they put Jackson Pollock to shame.
It takes courage to etch even a single line in an open space like that. Look closely at Rembrandt's mad, gorgeous dithyramb across the sky and be proud of your humanity!
I'll return to more recent illustrators with my next posting, but I just couldn't resist squeezing in one more Rembrandt. This picture gives me goose bumps and I hope it has the same effect on you.