The first image is a close up of the under-painting. This one has lots of yellow-orange, yellow, blue, blue-green, and yellow-green. Creating am interesting under-painting is the key to success in any negative painting. Making sure the blues and oranges don't gray each other down is also challenging.
The second image shows some detail in the foliage surrounding the flowers. Both negative ferns ( the light areas which were painted around the already existing underpainting) , and the positive ferns ( added on top in a darker pigment) are clearly shown.
The final painting turned out well. I was happy with the changes in color in the background. Variety is always a key to success in any painting in any medium. I glazed a few places with Daniel Smith's Luminescent Bronze. You can't see it in the photo but in person it adds just enough sparkle.
This painting is titled "Lily In The Pink." It is a good example of techniques that I love and teach. The interior pink shape holds two white lilies that are painted directly. When the lilies cross the border of the pink square (called breaking borders) their colors change and they join the background shapes which are painting negatively. The combination of positively and negatively painted shapes makes for an interesting and unusual composition.