This textual inversion is not focused on Joker as a subject, but rather on visual style, colors, and lighting. There are two ways to use it:
Generate images of men (it picked up actors from the movie) or interiors and city landscapes. Examples above.
Add it as a secondary style to your main style to add a variety of colors and lighting to the image. Better use, a few examples shared.
To use it, download it to your embeddings folder in Web UI installation and start the prompt with jokermovie style or style of jokermovie.
Enjoy and share the results in comments!