The first two pictures Volodya and Leonardo about the same age - school. Pay attention to the equally expanding to the top skull and prominent chin. Especially like wide-set eyes and brow line. Puhlovatye lips again. Well, children, all alike, you might say. A look at the more recent cards.
You can see that Volodya Ulyanov slightly more elongated head, but his eyes still drowned the same, and even podglaziny present in both portraits. Also like ears and high cheekbones, and a small beard only adds similarities.