You need to focus on the aspect ratio and panel layout. Webtoons usually have a vertical scroll format, so make sure your panels flow smoothly in that direction.
It depends on the terms and conditions you agreed to when you uploaded or submitted your comic to Webtoon. If you didn't carefully read and understand those, it's hard to say for sure.
The key to creating your webtoon comic is having a clear vision. Work on the script, practice your drawing skills, and experiment with different styles. And don't forget to get feedback from others to improve.
Webtoon does have a few 18+ comics. However, their availability can vary depending on your region and the platform's content regulations. Some might be hidden behind age verification or specific access settings.
Well, it takes a lot of planning and creativity. First, you need a great story idea. Then, start sketching out your characters and their designs. And don't forget to practice your drawing skills regularly!