Hard time recoloring with refine edge
So I've only ever used the refine edge tool to select flyaway hair and fur from a background, but now what I'm struggling with is recoloring a flower. I know it sounds dumb, I'm just doing it for fun.

Right now the inside of the flower is white and the edges of the petals are red, but I want the inside to be a light blue and the edges white, like this: (I know, im a nerd)

I saw the red flowers near my house and thought the petal's coloring was similar, so I wanted to try my hand at making it look as close as possible to the reference image but the refine edge tool just doesn't seem to cooperate. I started off selecting the red with the color range option and tried refining the details further toward the center of each petal, but the refine edge just selects the entire flower.
Am I using the wrong tool? Or is there some way to separate better between the colors?

