Sept. 16th answer

3. Why are the visual differences between Charlie Brown and Batman important?
via Andrew

Both are iconic figures that to us are as representative as much of the concepts they evoke as much as the characters themselves. Charlie Brown is the downtrodden everyman, while Batman is the modern Byronic hero (we're talking comics, here, not the TV show Jon linked). Both are comedic at times but, as "The Vocabulary of Comics" notes, it is their merging of art and text that allows them to also combine the comedic with an exploration of deeper human issues, and allows us to see ourselves in both characters.
Each comic-book artist's style somewhat reflects this. 'Peanuts' tends to be more simplistic and almost feels slower in style, while 'Batman' has flair for the dramatic. So while Charlie Brown can be all of us in an everyday sense, Batman is evocative of deeper human issues through its dramatic and in-your-face imagery.