Loose and free oil painting
The look is of a study, or the initial blocking in before detailed rendering, or just the work of a painter who eschews fine details.
Colors lean toward naturalistic earth tones, but you can push it to be a bit more colorful in your prompt, to an extent.
The output of this model, trained on the same dataset used for its SDXL version, was initially much more rough, dark, and brown than I care for. So I merged it with my Eldritch Oil painting model and an unreleased oil painting model that I use just for such merges. This brings a pleasing color balance and the crucial features of a scene, such as faces and hands, will tend to be rendered in more detail, while the environment often receives very gestural, abstract treatment.