Keychain, w/Yafray

I trying to get as realistic as I can, I know that the shadows need to be more prominent and I plan on adding some bump mapping for a key logo and scratches and writings,maybe some coins. I looking for some input on the key material mostly I don’t know of any other way to get the silvery bronzish color that my key model is so I tried to use splotches of the color in small size, you can still see the graininess of the material when you look close, If any one has any suggestions I would appreciate it.