Dark Sword's Medusa (Diterlizzi's range): metal, by Tom Meier (the master sculptor!)
For the rocks: cork+ polystyrene+a mixture of Milliput and sculpey+
Vallejo's Earth texture+ tufts+
Eduard's photoetched vine.
For the water, I've used two different water sheets from
Green Stuff World and
Liquitex's Gloss heavy Gel.