This piece is an illustration for the cover of The Pearl, a novel by John Steinbeck.
The story revolves around a poor Mexican family. The husband earns his meager income by diving for pearls. When his son is stung by a scorpion he searches for a pearl to pay for a doctor to heal his child. He finds a perfect pearl in the ocean that brings optimism and joy to the family but it also places a burden on the family they have a great difficulty dealing with.
You can buy a limited edition print of this painting in my Etsy shop.