Well, start by researching real-world locations or using reference images. Pay attention to details like lighting and texture.
To make good comic backgrounds, you need to consider the mood and theme of the story. Also, think about perspective and composition. Use a variety of colors to add depth and interest.
The key to creating good comic backgrounds is to have a clear idea of the scene you want to depict. Sketch out a rough layout first and then add details gradually. Don't forget to add some elements to make the background more lively and engaging.