Mystery couple

I found this terrific pair of paintings yesterday. I believe they depict Peruvian peasants -- based on the clothing. Each is signed ESE and dated 58. They are painted on what looks like twill canvas. The only problem I see is that they were stretched over cardboard, which has warped a bit leaving them looking a bit wavy in the frame, but the canvas is pretty supple, so it looks like that could be corrected.

Such an unusual pair -- I'm just not sure whether to list them under Collectibles: Cultural/ethnic or Art.