This is a special postcard. Lena (both Ekaterinburg, and Sochi postcrosser) has sent it from postcrossing meeting in Sochi. And as you have already guessed, the card shows Sochi postcrossers, drawn by Violetta Ferchuk.
I think, it's a great idea, isn't it? =)

P.S. Lena loves the sea and flowers. Will you find her?