I added Corrosion Texture from AK to some of the metal areas, painted the wood with the shown colors, and highlighted the rope with ivory.
Then the whole model was drenched in oils; Vandyke Brown for the bell and rope, orange for some rust on the metal areas, green to indicate moss growth at overhangs and the lower edges, and Burnt Umber (later mixed with orange for some variation) over all the stone.
