This style reminds me of a children's book called "Old Black Fly" - Some of the artistic content is blocked due to copyright, but you can still click through some of the book's art here: http://www.amazon.com/Old-Black-Fly-Jim-Aylesworth/dp/0805014012
I also bought the collection last year because of the drawings. The illustrator, Stephen Gammell, has also done some awesome happier illustrations, like Old Black Fly.