First Render in Cycles | Shell on Sand

Hi there,
this is my first post here and my first render with cycles as well :eyebrowlift:
I’m using Blender and before cycles I’ve used Luxrender. So I hope to find good tips for my new “friend” here at blenderartists!:yes:
So this scene is nothing special in modeling (just an shell like fractal with little microdisplacement (thanks to cycles again)); just playing with nodes in cycles… and what should I say… I’m impressed how easy it is to combine layered materials and on top the fast render times!:cool:
After Rendering I did a bit of color correction… so here it is…

GPU Nvidia 970 AMP! , 3840 x 2160 res, 2000 passes, about 20 min

Nice start, just put some small rocks around the ground.