This floral still-life is flooded with light so we will be using a high-key palette. High key limits us to tints and tones, no shades.
Choose a harmony. I see yellow-orange dominates and so I opt for a split complement with yellow-orange, blue and violet.
We’ll use the star grid to demonstrate the mixing of the three colors and what they look like with gray added.
I prepare my palette before I begin painting:
Top to bottom: Pure and mixed pigments, pigments mixed with white, tinted pigments mixed with gray.
Bottom two: blob of white, blob of gray.
As I mix each color, I place it in the star and locate it on my linear sketch, filling in each area where I think the color should be.
And now the mixed colors; yellow-orange plus blue:
Blue plus violet:
Violet plus yellow-orange:
And finally, adding gray: