( Not my Model )

https://civitai.com/models/2826646/111-rainbow-technicolor

This is a style with unnatural colors that can be a mix of technicolor, rainbow gradients, and cross-processed film. One of the features I was going for in my original dataset was a kind of "fake outdoors" look and I think a bit of that transferred over to this new version. So the outdoor photos can look like they're actually in a studio with a backdrop instead of being in a natural outdoor environment. This style also picked up on a bit of a tropical look and may add palm tree style plants to scenes.

Although this was trained as a photography style, it also does well as an oil painting style.

Some other complimentary phrases you might try in your prompt might include "technicolor" (sometimes better if combined with one of the decades: 1930s, 1940s, 1950s), cross-processed film, retro film, vintage, or fantasy.