Awesome! But it needs to be darker.

Maybe if the upper jaw seemed more connected with the lower jaw? Otherwise, awesome stuff. I do think it needs a little tweaking, but I still like this.

Maybe you could add some sort of design motif or engraving around the outside of the bowl and/or around the skull. You could get another couple colors in there accent key areas. Either awesome idea, id get one. :)

Ooh la la

I do like the base idea, but the design seems it just need to be pushed just a bit further. Seems a bit plain, and generic. Can't put my finger on it, but to me, it seems to be missing something.