The word "face" refers to the surface of the land. Alternate translation: "The famine had spread throughout the land" (See: [[rc://en/ta/man/translate/figs-idiom]])
Here "Joseph" stands for Joseph's servants. Alternate translation: "Joseph had his servants open all the storehouses and sell grain to the Egyptians" (See: [[rc://en/ta/man/translate/figs-synecdoche]])