Those are beautiful colors and all but the white from the warm end of the color spectrum. I might add a cool color, or as Elise1 posted, add a color that is not on the warm end of the spectrum. Since you're in Ontario, warm might be the look you want. I'm in Florida with a major heat wave, so I'd tone it down. So it depends on the look you want. The white might be enough. Time for colored pencils/crayons and a paper draft of the block?