In the oil paintings of Mary Johnston and Magdalena Hoyos-Segovia — the business partners who run the Magdalena Gallery — the common thread is an interest in color. Johnston paints brooding landscapes while Hoyos-Segovia paints people in dynamic poses. Hoyos-Segovia’s slightly abstract style conveys the essential geometry of her subjects’ form. Her color palette is at once simple and bright, seemingly inseparable from a basic optimism about human relationships. A striking example of such optimism is “Playtime,” where three children dance amid twirling pink ribbons and falling leaves. Johnston’s paintings, on the other hand, are more somber. Some of them, particularly “Immersed in the Clouds,” are more aptly described as cloudscapes than landscapes. The mountainous landscape below the brooding layers of clouds, in this painting, only takes up a quarter of the frame. The colors in the cloud bank range from white to dark brown and are reflected in the blue expanse of a lake below. Through Dec. 12; 317-844-0005, www.magdalenagallery.com.