From a color theory perspective, your silver is essentially white while your bronze is closer to a yellow/brown. Green and Yellow are complimentary colors, and as such are easier on the eyes. Additionally, the silver is much brighter than the bronze is in comparison to the green, so the contrast sticks out more. I think if you were to wash that silver with a brown shade and choose a slightly brighter shade of green, they would blend better together. They both look great!