Nice work with the metallics, but I rate it only a 7 I think because either the sculpt is just not very interesting or you didn't paint more details. One thing that bothers me is that the claws, IMHO, should be picked out with a different color than the upper body scales. Also, you could do the same with the "Head plate" thing. Basically, it only has 2 colors and that bothers me.
Good job overall, tho, really nice to see good work in metallics.