It’s the style of European comics (bandes dessinées). To be even more precise, it’s a French-Belgium style. Those two countries have an awesome culture and history of "bandes dessinées" which is hardly comparable to manga or US comics. It’s much more fine humor and hidden criticism than heroes and incredible adventures.

Also, here it’s a magazine which will sometimes talk about hard or sad topics so I don’t think you want something too bright, a neutral style like shown here seems to be the most sensible choice.