Thanks to all for commenting.
For more insight into color mixing, the palette as I remember, was: zinc yellow, primary blue (PB 15), not remembering the red? possibly Naphol, Burnt Sienna, and Ultramarine. Color seems a bit raw to me. With this in mind. what color relations might I have come up with to make it more convincing and less contrived?
It doesn't seem contrived to me, so I couldn't give an opinion on this. There are so many great painterly markings I can't see the color variations being any sort of issue.