The photo of the finished painting isn't quite accurate vis a vis the tones (too blue and too orange), but at any rate, here it is:

 

These are my attempts at mimicing the colors and shadings of Sandrine's reference photos. Results leave a little to be desired, lol!

 Using Arteza gouache, painted in a sketchbook. Top rectangle = orange-red @ bottom, "light apricot" in the middle, and light apricot mixed with white at top. Bottom rectangle = orange @ bottom and middle, light apricot in middle and top. No white. Quite a difference. The bottom rectangle's colors are closest to the orange colors of the reference photo, but still need some work to get closer to it.