The main things about leggings in comics are that they're a fashionable choice for characters and can help showcase their physicality. They might be part of a superhero's outfit for added mobility or a trendy look for a civilian character. Also, the design of the leggings can hint at the character's background or current mood.
Asian comic covers typically showcase a blend of modern and traditional artistic techniques. They might have elaborate backgrounds, expressive character faces, and symbols that hint at the story within. Also, they often aim to appeal to a wide range of ages and interests.
The characteristics of a cartoon thinking boy can vary. He could have a serious look on his face, like he's really focused. Or he might be shown scribbling on a notepad to show he's working through his thoughts. Maybe he's even daydreaming, with a far-off gaze.
You start by sketching a round shape for the face. Then, draw two big eyes and a wide smile. Add some details like eyebrows and dimples to make it look like Lil Uzi's style.