I feel like the style of the stone base clashes with the palantir a bit. Zooming in you can see the different tones but at 1x scale they all meld into a single color for me, and it ends up looking pretty flat. It's also a lot brighter than the palantir and draws attention away from it a bit.
Those cloudy textures on the ball are great though, and I like the little blue glow on the "hooks" holding it up.
Nice one.