Choose a split complementary combination. The rose has a yellow and cool pink cast so I’ll make yellow determine the split: red-violet and blue-violet.
High key light is bright and floods the subject leaving no strong contrast; like an overexposed photograph. Notice this palette contains only pure hues, tints and two light grays. You’ll also need a soft white.
Build a gray scale with light and medium gray showing shadows and highlights. Add one color at a time.