Give you a good closeup so you can see the bronze patina...

I used a combination of gold, bronze, and brass paints to get the base layer then layered a mixture of dark green, teal, and white to get the colored patina. The patina mixture was heavily watered down, applied, let it sit for about a minute then wiped off, to get crevasses and cracks to hold the color and give the whole thing a well worn appearance.