Level 1: Look at the red arrows and circles.
Level 2: You really must find the SOURCE of this.
Level 3: Y'know, there are some other texts there.
Level 4: Analyze everything about the picture.
Level 5: Even you, Brutus?
Level 6: It might be somewhere else than the picture.
Level 7: Reflect and ponder.
Level 8: I forgot to put some clouds in the sky, did I?
Level 9: Face it, you need to learn your music theory.
Level 10 and up: Sorry, but you're on your own.