this is on it's way to be good, try and dilute the colors a bit more. do more layers. That has helped me... just passing on what I've learned from others. In this case I guess I would start with a middle grey or dark and shade it down to black but keeping the higher points lighter - hense shading/highlightning. When using metal colors I tend to wash them, several times in different layers. Keep on - U will get better - I know I have