This really is a gorgeous dress. I sure wish Rina was my friend.
The colours remind me of a vibrant watercolour wash of reds and rich cobalt blues over a paler blue and pale purple background. The mostly red and secondary dark pink colours appear like large flowers, yet have an alluring, almost abstract quality about them. This stops the dress from appearing matronly. As mentioned, the background features a wash of a lighter, yet still bright and I would describe a pure pale blue and touches of pale purple, which lightens the look of the dress. Depth is added through darker nearly black highlights, surrounding the red flowers.
The v-neck of the dress is lovely - it shows your decolletage but still appears to be modest. The dress falls in gentle folds from just under your bust, but doesn't appear overpowering and adding bulk to your frame, like sometimes gathers can do. (Provided the sash isn't dreadful at the back with some sort of a horrible bow, from the front I kind of don't mind it! It is subtle and it picks up the black highlights as I mentioned above.)
Like others have said I would truly love to see you try this dress up in the next size. I would also say that because of the satin, you should try it wearing seam free, support underwear, to enable the soft drape of the skirt to flow gently over your body. I'm imagining strappy red, satin heels to set the look off completely.
Go on, get her to order it in....