This isn't an abstract painting, not even the beginnings of one. Rather it's paint squeezed directly onto a canvas to create colored ground for an autumnal painting. Golden ochre, cadmium yellow, and cadmium orange.
Next step is to take a big brush that I've dipped into clean water and spread it all around to eliminate the white of the canvas. The colors will mix as I work, creating a variation that is random and will serve as the first layer in painting a leaf-covered woodland (ala Klimt).
The important thing is not to mix the colors overly; the aim isn't to create a uniform color but to have them blend gently. Be vigorous in the brushwork too, varying direction and width. Although most of this will ultimately not show, some will, and it adds another layer to the visual interest you build up in a painting. Those little details you see on closer inspection, that keep you engaged with a painting.