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. Here are a couple of my example images when I added "oil painting" to the prompt:

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.