The writing's all back

You have no idea how long this took me! One drawing usually takes me 6-8 hours, and that was that. But now I was constantly checking every pencil stripe and editing the tiniest details! It took me days to get it done, and the result probably wouldn't have been different if I just did it the way I always do...
But still, it kept me busy. Better than doing important stuff, like,,, studying?

Of course from the episode 'The Big Bang'