I'd suggest asking locals. They might know of some hidden gem comic shops in Rotterdam. Or, you could look near universities or colleges as students often frequent such places for comics.
Funny sleep cartoons are appealing because they often show relatable situations in a comical way. They help us relax and forget about stress before going to bed. Also, the colorful and charming visuals add to the charm.
To generate a kiss cartoon of Generator Rex, one option is to start with sketches and then digitize them using appropriate software. Another way could be to find existing templates and modify them to your liking. But be careful to respect copyrights when doing so.
The 'One Piece' anime and manga have some differences. For instance, the anime might visually enhance certain battles or add more expressions to characters. Also, some story arcs might progress at a slightly different pace. But the overall story and themes are maintained.