Trying to improve upon classic comic and cartoon characters is like messing with Mother Nature. Still, there's nothing wrong with re-imagining a character from a different point of view. Tools like Photoshop make it easier than ever to give texture and shadow to plain line drawings, so converting our favorite cartoon characters into a more realistic style is too tempting to pass up. This is sometimes called "un-tooning."
Artist Tim O'Brien drew his more worldly version of Charlie Brown and named it Chuck Brown. This was created for a show called "Monsters".
This is just a small sampling of the many cartoon and comic characters getting the realism treatment. More are popping up every day!