I left the white petals unpainted, taking advantage of the white of the paper and the definition of the fountain pen lines.
The Color Scheme is Analogous with One Complement enjoying a reversal of the dominant color. I used the complement of the analogous cluster to be the dominant color, the Red/Violet of the background. The analogous colors, Yellow, Yellow-Green and Green are accents to the bold background shapes. The white petals allow breathing room between the colored shapes.
Drawn first with a fountain pen filled with Noodler’s Rome Burning Ink on Rives BFK printing paper, followed by washes of watercolor.