I have a good method. Anyway, the phone case is not expensive, only ten dollars. The method is to cut it with scissors to the extent that you think it is not good, and then shoot it with your mobile phone. This is a very beautiful effect.

Also, if you don't think the phone case looks good, the pen you use is a highlighter, and the color is silver pink. This kind of color painting on the phone case is also a feeling of being cut open, so you can draw as you like. In this case, it is much more economical than cutting the phone case with scissors. In addition, you can draw whatever you want, which is very creative.