From Wikipedia: According to Serebriakova, the winter came early in that year, there was a lot of snow, but it was warm in the house, so “she started to paint herself in the mirror, entertaining by drawing different small things from her dressing-table”.
Here’s a great video describing the context of the painting and Zinaida’s rather tragic life that followed this happy moment.
Other paintings by her:
Oh good to know thank you