Nice design and color palette. The purple gems with the gold trim is a great combo. Since the gold is reflective, you would also see hints of purple on the gold near the gem. The wood on the front appears to be really shiny since there so many highlights and dark areas right next to each other. You should use hot spots on the wood more sparingly. Here is a good tutorial for painting wood: http://gimaldinov.deviantart.com/art/How-to-draw-wooden-plank-267517599?q=gallery:gimaldinov/32009074&qo=0
It's looking pretty awesome so far! I agree with the previous comments about adjusting the gold colors. I feel like there could be more contrast and darker shadows, to help distinguish what's over what. It all looks a bit flat right now, so doing this will help distinguish which parts are above others. My words are meh, so here's a paintover gif thingy! Hope it helps.
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And check this:
http://foervraengd.deviantart.com/art/Tutorial-Painting-Gold-490209106
Good luck!
Looking forward to more updates!