I like the updated srf variation.. alot. Just a few suggestions if I may; some additional displacements (PF & or redirect) as well as more color variation on your rock base. The stock grey is a but flat compared to the rest of the image. Also bit of contrast in the effects tab will go a long way in an image like this and last but not least some higher render settings, AA and GI srf details. These are pretty simple ways to get this image popping. Looks promising. Good luck my friend ^^