How does the northern Renaissance differ from the Italian Renaissance?

Southern Renaissance came first and focused on Humanism, which is gloryfing man and focuses on human values, The southerm, or Italian Reniaissance, refered back to the classical styles of the Greeks, making ideal images. The Northern Renaissance however approached at a much slower rate and can also be classified as Late Gothic. Unlike the secular styles that the southern art sometimes portrayed, the Northern art stayed focused more on religion. These pieces used alot of iconography to display symbolism in there works. Also different types of medians were used. The Italians used a lot of Fresco which is actually mixing the dyes of the paint with the plaster in the wall as it dryed to paint a mural, versus just painting on the exterior of the plaster itself. The Northerners painted on a lot of wood, and made diptych and triptychs.