Into my opinion the cartoons by Tony Houbrechts (aka Toni or Cartoni) are old school. This in a very positive way of course.
This is the wikipedia definition of the noun:
"In slang, "old school" or "old skool" can refer to anything that is from an earlier era or anything that may be considered "old-fashioned". The term is commonly used to suggest a high regard for something that has been shown to have lasting value or quality.
It may refer to: music, film, literature and art, computers and gaming, others"
Remember "high regard and lasting value or quality". The cartoons aren't old fashioned at all, they are just timelessly funny and drawn in a traditional way, without all that Photoshop stuff.
bio of Tony Houbrechts on ECC website