Just some doodles during class. It's Michael's progression of fat.
I love deciding what colors characters choose to wear. Michael's one who goes for more muted and cooler colors but that's just when he's thinking about it. Most of the time he just grabs whatever off the shelf and doesn't really think about what color it is or how he looks wearing it, so he often ends up wearing ugly and blah-ish clothes because he really doesn't care as long as it's comfortable. But that pink hoodie, he didn't buy. He's afraid of people thinking he's a fag, so he avoids pink. But Jacob bought it for him, so he feels bad not wearing it