Well, to render a dystopian novel, you need to think about the power structures in your fictional world. Are there a few elites ruling over the masses? How do they maintain control? It could be through mind control, strict laws, or scarcity of resources. Next, consider the social fabric. Is there any form of resistance? And how does the general population cope? Do they blindly follow or are there pockets of hope? You can draw inspiration from real - world issues like environmental degradation, political unrest, or inequality and exaggerate them to create a truly dystopian world in your novel.
To render for comic covers, start with a clear concept. Study other successful covers for inspiration. Experiment with different styles until you find one that fits. Don't forget to add details that draw the viewer's attention.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
To render a comic face, practice sketching different face shapes. Also, study the works of famous comic artists for inspiration. Pay attention to the placement of eyes, nose, and mouth to convey the desired mood.