Nice work!
Tons of great details, lighting, and materials. I especially like the hair and smoke effects. (and of course the sculpting and modeling :))
My only criticisms are that the frog looks a little lumpy and imprecise compared to everything else, and the droplets of magic juice in the air seem to be pasted onto the scene, instead of being a part of it.
Reminds me of the witch scene I did a couple years ago for a challenge in the Sculptris forum (Yours being quite a bit more refined, of course!):
http://www.zbrushcentral.com/showthread.php?133109-Winner-sculpting-challenge-quot-The-Witch-quot
Thanks for sharing!