This one is captioned on the reverse, "on right Clarence Brassfield 1917." It also says Novelty Postcard Studio, 605 4th Street, Sioux City, Iowa. Clarence Brassfield (1895-1941) was the older brother of my great grandfather, Floyd Gipson, Brassfield. Unfortunately, the caption does not indicate who the one on the left is, perhaps a friend or maybe a cousin or other relative.
