The crown is partially well done in terms of trying to capture that metallic tone. However, the shading in general could use significant improvement. Try scale down the piece and attempt to shade without having to resort to the brush tool.
On the plus side, the hair shape is well done but still suffers from a lack of proper shading(especially around the fringe and tips).
Thanks, I will get back to this and fix the shading, definitely rushed it. Also, never used the brush tool :o