In the previous chapter, Pierre has told Princess Marya of his life-long love of Natasha and his desire to marry her.
Princess Marya is a little torn, as both she and Natasha are still grieving the death of Prince Andrei, Marya's brother and Natasha's one-time fiancé (until she tried to run off with Anatole) -- that was a deal buster!). But in her heart Princess Marya knows that Pierre and Natasha are right for each other.
There is an understanding between the couple, but Pierre must go to St. Petersburg in the meantime. The 3 flowers represent Princess Marya, Natasha and Pierre in their quest for love and solace. -- Lola
from page 641-642, volume 2 of original text
collage, acrylic paint, flora from Yasnaya Polyana
Pevear/Volokhonsky translation page 1125-1126