A self-portrait of the painter at work, 1884
The religious philosopher Vladimir Soloviev, 1885; as a portrait of a thinker this is most impressive I think.
The artist's wife Sophie, a relatively early painting from 1863-4.
The artist's daughter Sofia in 1882; apparently she became a painter too.
Some sort of divination or fortune-telling (quite a common theme in 19th Century Russian painting); perhaps some Russian friend can explain what is happening here.