Doodling #2 Studying

Sinking in my books, I had no time to have much fun... I passed the past week trying to print on my mind, the most things I could, to do the national exams for college admission. It's like the SAT from USA, but in my country is ENEM.
It all made my inner artist came up with this doodle:

I am actually working to put color on this one, glad the exams are done, and glad my blocking vanished.  Now I can finish the other pieces I was trying to continue