Here's a scanned image of my gray scale. It's blurred to knock down the paint strokes, making it easier to read levels in Photoshop. I was looking for RGB values as equal as possible for true neutrals. Most mixes were close; one needs to be cooled down.
Here's that same rose with more glazes. I'm playing with warm/cool relationships and form. What made a huge difference was simply softening edges of the flower's outside shape. It seemed to pull together foreground and background.