The canvas was flipped over. More white, yellow ochre and a mix of the brown with both colors added, then wiped away in places after spritzing with water or waiting until the paint almost dried. I now see a large white shape on the left and a smaller horse head touching that, to the right of mid-center. I'll do negative painting behind those shapes that will become horses, then add line here and there for definition, using a subtractive approach with this work in progress.
Image is COPYRIGHT 2013 Kay Smith.