I think the main problem is that the blade looks like it's made out of stone. Working on the reflection and specular should help making it looks more like metal (dark diffuse but bright specular). Same for the golden parts, the diffuse should be dark brown and the specular should be light yellow/gold.
Thought I'd just do a very quick run down of some experiments I've done. Honestly think I could do a bit more tweaking but I've been a complete idiot and been staying up late burning that candle at both ends. I know I've had both BradMyers82 and Chris Krüger say to change the design and experiment more with the silhouette…