Working on the First Executioner!

So, I have been doing a little painting this morning and have been experimenting with a color scheme I like a lot. So far I have been using naggaroth night purple and balthasar gold mostly. So far, I think he looks pretty good. I have been having so much fun painting him. One thing I am worried about is how I am going to make the armor look good, look metallic. If anyone has any suggestions, please let me know!