Andy,
I love the idea behind this. The effect you've created really is reminiscent of a stone wall especially on the pot section.
I'm not so sure about the lid, it has the carving going all the way through, and I would not see that holding together in reality as such a thin section. If it was thicker, lumpy, uneven, or some-such it might carry it a little better in my eye.
As for the bones in a hand, that's maybe a different vision but it still does not fit with the blue, and I really like the colour effect you've created.
I'd really like to see this in shades of gloss grey simulating a flint wall.
Can I ask what sort of tool you use to do your carving please.